This is an interesting plot twist that can go so many ways

Pluses
1) Dresden and Lara have a great deal of respect for each other.   
2) They are also clearly attracted to each other in a way that has nothing to do with magic or inner demon beings
3) This ties Lara even more tightly to Mab -- a very strong political alliance for Mab.  After all, the White Court has a great deal of power in the mortal world - where Mab is fairly weak (relatively speaking).
4) It demonstrates Mabs power over Dresden in a very public way right after he was just super scary
5) It provides another layer of protection for Dresden vis-a-vis the white council.  I am sure there are other allies of the White court that would not hesitate to target Dresden before but would hesitate after a marriage.
6) Does this give Dresden access to white court resources?  Aka - cash and favors? 


Negatives
1) Lara feeds on souls -- so hard to see how they can have a marriage without that being a pretty strong barrier
2) Dresden is going to resent the hell out of a political marriage and that will create a lot of issues.  And if it becomes a real marriage then either Mab loses a lot of control over Harry to Lara (aka - she feeds on him scenario) or it turns to love and this becomes very damaging to Lara. 
3) A lot of worry that Lara is infected by outsiders based on odd behavior.  That could have been Justine distorting things-- or it could be a real sign that Justine infected Lara (or visa-versa as her father was probably associated with outsiders as well.
4) A distraction for Dresden. Normally that would be a good thing for Mab, but things are very ugly right now and having her winter knight be off his game would be dangerous. 
5) A political marriage involves obligations on both sides.  What would Mab promise Lara to make this happen?  Or does Lara already owe Mab too much to say no. 
6) Kids - enough said
7) Lara is the responsible type -- and a soul eating vampire.   Relations with Maggie will be complicated.....  of course, this might explain why Maggie goes to boarding school.... 
8.) Dresden will have obligations to Lara that might conflict with his obligations to Mab.  And Mab cannot just override such obligations as winter law applies. 
9) Lara's family are mostly a bunch of monsters.   Her extended family/court even more so.   That cannot end well when Dresden walks into the room.  And they are unlikely to take a few random deaths as well as the winter court did. 

He didn't try and take Justine to Demonreach and imprison her because between the battle itself and the effort required to bind Ethniu, he was running on fumes. He could barely stand, let alone throw his Will against a Walker.

This makes no sense because he was willing to confront the outsider on the boat where he had access to none of the resources of Demonreach.  If he was too weak, then he should have made up some excuse to stash Justine somewhere else.  Not confront her on the boat. 

The shield bracelet and stuff made life easier..  The island has a lot of stuff but it isn't exactly the local
magical Ace Hardware store, Harry made due with what was at hand. 

This also makes no sense.  He had a number of visits from Thomas and Murphy while on the island.  He could easily have asked Thomas to acquire a set of tools and some raw materials.    Yet he scratched his staff out with a nail or something instead.     I get that after skin game he was highly distracted and seemed reluctant to get back in the game which may be a natural human reaction, but the time between cold days and skin game is inexcusable. 

I wonder why Dresden burned Carlos during the meeting.    Yes he had to create a distraction, but why target Ramirez (aka - a friend) rather than some warden or other attendee at the meet and greet. 

Other enhancements are just as powerful.  In no particular order as I cannot remember which book provides which.
*  After training molly, he can do veils a lot more easily
*  In ghost watching molly, he sees the power of illusion
*  As winter knight, he starts to effectively use cold magic -- first in Changes with mixed fire/cold attack, but I would argue more effectively in cold days
*  Reputation is power in the supernatural world - and Harry both builds reputation and leverages his reputation to get things done
*  His resistance to outsiders realized in cold days
*  His ability to block pain learned in Dead Beat from Lasciel
*  His summoning in book 1 that he used again a bit later in book 4 or 5, but not much since
*  Necromancy knowedge gained in Dead Beat.  he does not use much, but he did use
*  the ability to understand and speak multiple langues (and access to magical theory/history) gained from Lasciel and lost when he gave up the coin
*  He picked up mind magic in a much more effective way (defensively at least) after Turn Coat
*  Bear power belt showed up in book 2 and never came back* 

There are only two decisions at the end of the book that were "major".   

1) Did he say "I love you" to Susan when trapped in the room

2) Did he accept or refuse the vampire's offer at the end "to walk away" at the price of leaving Susan behind. 

Both would most likely have led to Susan's death (or becoming a blood thrall) and both would likely have delayed the war with the Red Court.  In the first Susan's death would have made it acceptable for Dresden to accept an adjudicated settlement and the chance for later revenge.   The 2nd required that same outcome. 

No war would have prevented the mass extermination of Wardens and delayed the actions of the Kemlerites quite a bit.  So the events in Dead Beat would not have happened and Harry would never become a warden.  As his warden status and relationship with Lucio went a long way to reconciling Harry with the White Council, it is easy to speculate that Harry's interactions with the council get worse rather than better, especially with the "negotiated settlement" likely to really piss Harry off.  Enough worse that when Molly exhibited power, he would not have trusted them to judge her correctly.   

And at some point the war with the Red Court will start up -- with Harry's help- but this time the White Council really will blame Harry. 

At that point, I suspect plots have diverged significantly and I will have to wait for Mirror Mirror to see what ended up.   

Random comments

Traveling via never-never can be a good way to travel the globe, but it can be very dangerous so you are pretty limited to the paths and routes.   I can see the value for smuggling small high value items.  And I suspect the routes that are safe are also controlled by the White Council - which would probably become aware and seriously annoyed if you make their paths part of your weekly drug smuggling run.

It would be extremely dangerous to try to use the never-never to get into bank vaults.  Remember, the other side has to have an affinity.  To get to a never-never spot that opens into a bank vault means you need to break into a never-never bank vault just to walk into a mortal bank vault.  Not seeing how that is easier.

I suspect the White Council does help its members with identification issues.  They have the expertise and contacts to make this work pretty easily and their members would be pretty clueless for the most part. 

Robberies in general, especially robberies targeting illegal organizations like drug dealers or gangs require good intelligence and open you up to risk.  After all, you physically have to enter their premises and take stuff.   You have to collect intelligence - which might be noticed or wrong.  And if you hit the same place multiple times, they will adapt.   Small robberies minimize risk, but consume a lot of time per dollar gained.   Large robberies get you a lot more cash, but require a lot more research and/or connections to make happen and a lot more danger when selling the goods (if not taking cash).  And if your robberies are too spectacular, the wardens might get annoyed as they do like to keep mortals clueless about the presence of magic.  Not a law of magic, but they can still make trouble for you. 

I guess I am saying that crime is an approach that can work, but the wizard must be intelligent and skilled in how they go about it to manage the risk. 

I think the benefit of compound interest can be seriously oversold - at least as soemthing that provides real benefit to most wizards.   

It requires several elements to be successful and all are problematic for wizards.

1)  The person must first have wealth before they can invest wealth.  Few people have the personality to sock away substantial resources today, so I cannot imagine the wizard population is filled with a hoard of atypical savers.   So a poor or even middle class wizard is not going to be able to save enough money to create a small fortune through compound interest.

2) You must have something to invest "in".  Stock or bond markets really did not exist before the 1600s and before that investments were typically limited to business you were actively enraged in or in land ownership.  Hands on ownership was the norm really until the mid-late 1800s. So opportunities for absentee investments were pretty limited and few wizards would get rich on hands on small businesses.

3) Investing wisely requires real skill.   You are most successful when you understand the business and change your business strategy as the world changes.   Few wizards would spend the significant amount of time required to understand the market -- and spend even more time each year to keep that understanding current.  Add into this the fact that most wealth creation came from technology -- and wizards are horrible with technology.  They are also unlikely to spot new trends in technology or recognize when a previously successful technology is no longer the wise investment. 

Keep in mind we had multiple very serious recessions, major technology shifts, and other disruptions that could easily have destroyed all a wizard's investments if not managed correctly.  And while it is true the wizard could have invested in very safe government bonds, the reality is that few government bonds were really safe prior to the 20th century (exception - Bank of England) and I am sure WWII also contributed to a lot of bad debt.  Even if your bonds paid off, the safe ones rarely earned much after accounting for inflation.  Such investments protected your fortune, they rarely "made" your fortune. 

4) The wizard is not alone in using magic or investing in the long term.   There are many supernatural races who are both long lived, have access to magic, perhaps have some ability to see the future, and would choose to invest.  The White Council's own investments are a perfect example.   What this means is that the wizard cannot rely upon magic to provide a major advantage, at least once investments become substantial.  There is just too much competition who can play the same game.