First two books of ASoI&F were pretty good, I thought. Then the rest were just him writing himself in circles, ever more slowly. Then the TV adaptation came out, to initially great acclaim, and then ended with a damp fart.

Yes, there were more problems with the end of the show than just his plot, or lack of it, but I can't see that the ending will be redeemed without substantial changes, and his skills as a writer don't really extend to "writing towards the desired ending".

I think if we do ever get a conclusion to the book series, it will be written by someone else; I believe he's left instructions to destroy all his notes and work-in-progress when he dies?