You're making the same mistake AI people do. You can create stuff that's like what came before all day, but it won't create anything new. Literary analysis, like these plots and the more common monomyth, is about what already exists, and lags far behind. It's the same deal with music theory. People will spend years in music school learning all kinds of stuff about music, but then they have no idea how to make anything anyone wants to listen to. Music theory as taught in schools is just catching up to jazz, rock, and rap, and there's a lot of resistance.

An AI could probably do some solid analysis, like producing a beat sheet from a novel. That might be helpful. I could pants a draft, then have an AI make the outline for the second draft.