As ever, the standard defence of LLM and all gen AI tech rests on this reduction of complex subjectivity to something close to objectivity: the picture looks like other pictures, therefore it is a good picture. The sentence looks plausibly like other sentences, therefore it is a good sentence. That this argument is so pervasive tells me only that the audience for 'creative work' is already so inundated with depthless trash, that they can no longer tell the difference between painting and powerlifting.
It is not the artists who are primarily at risk here, but the audience for their work. Artists will continue to disappear for the same reason they always have: because their prospective audience does not understand them.