It is likely that we will reach a point where these ML things will recognise patterns across creative works, see what sell and use them to make similar stories using those same patterns.
Which is clear they will sell more since they will be cheaper, faster to make thus flooding the market with engaging-but-unoriginal stories.
Imagine: a GOT in space, a GOT in fantasy, a mix between Star Wars and GOT, and so on. And they will always sell cause GoT is engaging, but none will be original but a soulless copy of the original GoT (for which Martin won’t see a buck).
Tbf, i think it would be better to ban this kind of “AI” - like ChatGPT, or the ones for the art et similia - from “producing” creative work - at least creative work to be sold - but capitalism gotta capitalise I guess.
EDIT: to be fair right now the main concern is about copyrighted creative work, but probably it’s the easier to ascertain if it’s been copied or not: take for example programming code, there are very few ways to know if a copyrighted code has been used and it will probably show how copyright is SO dumb and fallacious for technical and whatnot fields