Never say never. A lot of popular books in more pulpy genres like romance or mystery are already incredibly formulaic. It wouldn't be too outlandish for some publisher to just feed in a massive corpus of genre fiction into an LLM and plop out dozens of books indistinguishable from those written by people.

They're not my cup of tea, but they keep landing on bestseller lists because people like what they like.

I'm assuming we are also going to eventually get to a point where large publishers are just going to start using AI reviewers to give books written by human authors a once-over to suggest "improvements" that could make the book more marketable or consumable.

Independently published works are going to eventually be the only way going forward.