Even aside from "AI", movies are already formulaic - you plug in popular celebrities into an already-told story, pick a setting and music, there you go.
I kind of wish they already let you generate this - you want that celeb in this setting, or a mixed race couple, or all Asian characters, etc, go for it vs studios picking and choosing for you.
Virtual celebrities are here. Hatsune Miku was the first. They're a big thing in China.[1] Partly because they can't get into trouble in their private life.