That's as may be but the oft repeated conceit that it would be corporations doing it is clearly not true in this century.Eg new book everyone just copied it.
Plus, you've assumed out of hand that it's important for this to always exist as a viable career. But society's need for professional writers stemmed in large part from the same vanished conditions that used to make corporations the most likely people to copy a work. It's so easy to put things out there now that (even without AI) vanity press is more than enough to cover society's content needs. I don't know if you're old enough to remember, but if you are then cast your mind back to the turn of the century - there were tons of videos, games, and and webcomics floating out there with nary a paywall or attempt at monetization in sight. That proves to me that it could work; that the industry is not strictly needed. And what good is an industry that's not needed?