It shouldn't be like so, I think generative AI can yield great results if there is enough human supervision, I think it can be great if used to augmenting creative work. But I think many will chose the shortest path towards money and they will put in the least amount of work possible.
Imagine tens of thousands of movies spitted by AI based on sub mediocre screenplays, imagine millions of songs generated by AI based on sub mediocre lyrics.
Somewhere, in that ocean of junk, there is something valuable. Good luck finding it.
If we use CGI analogy I can say that all pre CGI Tom and Jerry cartoons are works of art but many of the cartoons released after aren't so great, while some are. And CGI still requires some effort, so not everyone is be able to release movies. Generative AI will require far less effort and knowledge.