I was wondering how quickly do people think a small number of Black Court Vampires could replenish there number if they were in a hurry would zombies (horror movie) level of reproduction make them unbeatable?  I ask this because there is no making people into vampires powers so I am at a loss at to how it works?

My read was that BCVs could have that level of reproduction, but that the near extinction of their court left the survivors with a bone-deep aversion to anything that might call attention to the Court, and passed it along to their offspring.  So a powerful BCV?  No.  A stupid one?  Maybe.  Long enough for a story anyway.  It certainly wouldn't spread world-wide, practically the entire supernatural world would have at least a couple reasons to want to put the kaibosh on it, but I can certainly see them overrunning even a smaller city for a while.

It wouldn't make a wizard less powerful if, every time he desperately needed to cast spell X he got a Fate point instead?

"Ok, the house around me is fully engulfed in flames.  Hm.  Ok, I'm going to use Fire to channel the heat and flame away from me, leaving me safe."
"Hm.  That's a pretty good idea, and it certainly would have protected you from the fire."
"Great.  Then I ... wait a minute, what do you mean 'would have', and why the evil smile?"
"Here, have this nice, shiny new Fate point.  I'm eager to hear your backup plan!"

It should be safe to assume that he has the points to buy out of it, given how many compels he's probably already taken.

Gotta agree.  The reason Harry doesn't use it more than a couple times is that he specifically has issues with control and doesn't want to mess up and begin a brief career as an intercontinental ballistic wizard.  In calmer circumstances he's managed to use Evocation to float a bottle of liquor from a cabinet to his hand (Turn Coat) so it's certainly in a Spirit user's wheelhouse. 

Rapport probably not, but the purpose of Athletics is to move you around - why couldn't you model that through telekinesis, a perfectly controlled surge of wind,

Well, with Harry the downside of this method of movement is getting spattered across the landscape if it goes out of control, which is always an option with magic, especially if the Wizard has any aspects you could compel.

a pack of stone sled dogs,

I'm not an expert on Evocation, but isn't it fairly direct and straight forward?  Animating stone dogs that last for any length of time would seem to be the province of Thaumaturgy.

or a flowing ice halfpipe?

Cool enough to momentarily ignore balance issues IMO.  Also wouldn't sliding in an ice halfpipe require it's own Athletics roll?  Might be a cool way to avoid barrier ratings or get to inaccessible areas though.

As for Craftsmanship, I'd argue that fixing or constructing things is within the range of Earth or Spirit

Again, fixing or constructing seems beyond the scope of Evocation. 

Water, Fire, and Earth all look good for structural attacks.

No argument here, Evocation is good at smashing shit, though if you count lightning among Air's elements there's no call to count that out.  Also raw force can smash stuff good, so Spirit should be in there too.  It really doesn't take much to spot the destructive potential of the various elements. 

See, this is one of those times when, as a GM, I’d let coolness trump RAW in a hot second.

Player:  Nice.  I duck under the ghoul’s claws and then, while he’s overbalanced, trigger my force rings, sending him sailing into the other ship.  Can I use riposte for that?

Me: Why not.  Awesome.  How much damage?  Okay, you shatter most of his bigger bones.  His broken corpse sinks beneath the waters, leaving nothing but a greasy splotch to mark his passing.  Now…

That said I get that you’re handing the PC a bigger advantage than Riposte is supposed to confer, so I probably wouldn’t make a habit of it.

My bad, I thought you were one of the folks involved in the overwrought battle over retractable claws.

From what I know about Anita Blake it would be better served by a WoD style system.  That world's vampires are far more differentiated, with complicated and meaningful distinctions drawn between bloodlines, ages, etc.  You could do it with Fate, but it seems like the powers themselves aren't granular enough, not just the costs of the powers.  Even with a fairly vanilla DF style game having only three levels of superhuman strength is occasionally a bit limiting. 

Retractable claws really bother you huh?