Are movies the right approach?
TLDR I see a lot of people wanting Gojo vs Sukuna as a movie, but I think that would actually hurt the adaptation overall
This mainly came from seeing Demon Slayer fans constantly bringing up movie success and using it as proof their adaptation is better or more mainstream (I don't know just fanbases arguing as usual). But people 100% forget what happens when the movies get folded back into their series.
With Demon Slayer and Dragon Ball super, those movie arcs were later made into the anime. And for me those parts were hard to watch. They stretched things out with low quality filler and had to downgrade some animation just to make it fit the new episodes quality.
Then you look at JJK and it’s like the opposite. JJK Execution ended up feeling pointless and kind of rehashed things, while the actual season 3 adaptation was insanely high quality without needing that movie at all. It just made the movie feel pointless.
JJK 0 worked because it’s optional. You can watch it and get more context (and yes I know it's canon) but you don’t need it to follow the story. That’s different from adapting a major arc as a movie where you actually have to watch it.
So that happening the JJK would generally hurt the anime as a stand alone series. Not to mention half the jjk hype comes from the weekly format of the chapters and episodes, like that just wouldn't work with a movie.