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.
Before, humans used to do the exact same. Why is it be different now with AI? It's just more and faster imo.
Why would anyone read GOT in space when they can just read GOT? The people opting for GOT in space will most likely already have read GOT anyhow. And that already takes long af. So it's a smaller fan base closer to fanfiction, which btw already existed before AI became a thing. It will never surpass the original. Also copyright should never forbid someone to write in the style of someone else. How would you even proove it?
Why should we ban AI, a really useful technology, also for co-collaboration within the Arts, just because some people will make money with it? Art has been constant copypaste remixing anyhow.
I'd rather have us get rid of capitalism instead lol, which is the actual reason why commercial artists are scared. Hobby artists don't give a damn lol.
Edit: There's technique in art too, which some would define as style. Copyrighting a style should therefore not be an option.