I think you’re underestimating the rate of advance and the appetite for derivative work.
My impression of the appetite for derivativeness is that it’s waning, no? The authority on the craft of content milling seems to think so. [0]
0. https://finance.yahoo.com/news/bob-iger-says-disney-cut-1157...
the single largest selling category of books is romance novels, and if you've ever spent time in that space -- I used to worked in a book store, and would read anything to kill time, including romance -- is often painfully derivative and repetitive. Amazon was flooded with e-book romance novels long before ChatGPT, and it's only going to get worse.