will become scarce and likely only for the rich to enjoy
Look at the other side of the coin, every single person on the planet is going to have instant access to an artist in their pocket, a little machine that they can give an instruction to and get a workable piece of art out of.
That is something that only the rich have access to right now, enable creative expression beyond our wildest imagination for all of the people who don't have 5 to 10 years of their life to dedicate to learning art.
You looking at the negative, a relatively small negative, and totally ignoring the positive side of this coin which is going to change the face of human creativity as we know it.
It's like being angry that only rich people are going to have bands playing in their restaurants because the poor people will be using records. Sure, but we quite enjoy having prerecorded music nowadays and we would never give that up in exchange for live artists.
The same principle applies, our lives will be improved by this and as long as that's the case it's a good thing, even if it means change.
From my perspective you're fighting to keep this sort of self-expression in the hands of the few instead of the hands of the many. Your practicing elitism and pretending in the process that you're fighting for the common person, but the common person will benefit more from widely accessible and easy to use tools than the rich will.
i dont see why they would share it freely anymore
Because humans like to express themselves and share that expression as widely as they can for no other reason than the active sharing and having their works seen by many.
The most pure and durable Art is Art as a hobby. Art as a form of self-expression?
this assumes that genAI models can improve without any new input
They can. Or at least, you can use things like human rating systems to guide an AI to produce outputs that people enjoy and train it that way instead of using raw works of art.
As a rule, if humans can do it, AI can do it too. It's only a matter of figuring out how.