I am 💯 convinced he’s been done with all the material for years and it will all get released on his death. He had a huge amount of leverage for those last deals and he’s paid for all time based on what he made from HBO.
My guess? He just didn’t like what he saw in those last seasons, and doesn’t feel like he owes anyone anything. Maybe we’ll get the rest when he passes, but he’s probably just not worried about it and living his life.
If you want to call it that, then yes. I fear that to him, this is a big project he is no longer excited to finish. Like learning a language and then losing interest or building something in your backyard.
First progress slows down, than nothing happens anymore and finally, after years, you cancel Babel, clean up that stuff in the backyard and let go of your unfinished book series that has build way too high expectations anyway.