People getting better at writing is only going to increase the quality of the output.

Increasing both competition and tooling (by providing every writer with the world's greatest encylcopedia/thesaurus/line-editor/brainstormer/planner/etc) is only going to make writers better.

Will there be lots of people who misuse the system? Are there lots of people who use thesaurus words without knowing what they're talking about? Can't you tell the difference?

I see in LLMs a lowering of the ground floor making it easier for people to get in. This will increase the total availability of content.

I also see in LLMs a raising of the top bar making it harder to be the best. If more people are writing and more people are trying to be the best, the best is going to get better.

Consider chess. Have we suddenly stopped playing chess now that a phone can beat 95+% of people? No. The market is stronger than ever and still growing. The greatest player in the world use the chess algorithms to refine their play and the play keeps expanding in new and interesting ways.

In both writing and chess, yes, there is an explosion of low and middling play. But since when have we not always had people producing content and playing chess that when compared to the masters of the field is generally viewed as substandard?

But here's the kicker. Some people's favorite genre is badly editted fanfic. Some people genuinely derive actual pleasure from things that you or I might call garbage. And what's wrong with that? Who am I to say that you can't love clutzy firecop loves suburban housewife paperbacks? Or Zelda/Harry Potter crossfics or whatever.