I think I simultaneously agree with many of you, even those who said opposite things

I still like the DF books, some less than others. I like some of the new characters, like Goodman Grey, but I could have lived without them. The fact that I enjoy the books does not mean that I don't feel they are dragging. More characters are added and they are indeed too many loose ends. Like, now we are having Librarians? A full organization that never appeared before? Harry is having a new apprentice? (perhaps not a new character, but still, we have already seen mentor Harry. He should be too busy right now).
We have not seen characters like Elaine (I don't particularly miss her, but that is not the point), Ivy, Kinkaid, in lots of time. And at least we have an in universe reason for that. There are other characters who disappear without a trace (like Vince, was it? the p.i. Or other characters I even forgot the names, the kid who may be Tera's son). I wish we begin having answers and wrapping things so at least I hope we tick some squares with the starborn thing.
I wish there are less books. Like do MM, then the fight one and then the BAT! But those are my wishes. And Jim does not work for me. Yes, I give him money for his work, but that is a exchange. He is not my employee. So I have no reason to complain. He does what he wants, he writes what he wants, at his pace, and that is fine. I owe him too many happy hours and this forum, so I am for ever grateful.
Take all the time you need, Jim.
On the other hand, it is true that I do not understand the commercial side of this. I have no data but I would think Jim is not making such a good profit with the DF as before. Let me explain my rationale. Let's have a universe of DF readers and think in the next book. There is a subset of the readers which are people like has been reading for years. Most of that subset is going to buy the next book, but some of them are not, because they grow tired of the book, or bored, or has no money, or are not able to read anymore, or they just died. So, the subset is reducing. Then there are new readers. People who heard the series is great, or began reading the books because they were at their parent's or just sees him in the media (or actual bookstores or libraries) and got interested. But how many new readers decide to began reading a saga with 19 books and many more to come? I think the universe of reading is having a negative balance between loosing and adding readers. Is the remaining subset enough? Perhaps. But I think if Jim wrapped the saga he would have a big wave of readers (new and returning ones, their interest piqued) and he would be able to begin an entirely new saga that could attract new readers (of course, many would be DF readers, as they probably like JB style). So, I see economic profit in wrapping more than in spreading the saga. But well, that is me and it may be factors I don't know, or I am wrong about.