Can't it be both? In Marvel movies the plot, story, and characters are irrelevant and it's still the current greatest American cultural export.
There will be some creative people that can now tell stories they couldn't before with AI, but I think by and large the major use case is to create short form video clips to get attention on the internet (advertising). I don't foresee a "movie" (meaning narrative story told via visuals and sounds in 1-3 hours) renaissance happening, in part because I think the form is fully mature and there's not really much more that can be done with it. It's essentially gonna be where Jazz music is today in 40 years, it will have its fans, and there will be talented practitioners, but every year it will be more and more culturally irrelevant.
They might have been in the last decade, but now it’s just yet another franchise audiences have stopped caring about.
You may want to watch again the movies that created the franchise.
All the successful Marvel movies are completely based on the characters.