That's like saying all fine art would be photography, all film would be CGI, or all music would be synthesized electronica.
That's not how aesthetics seem to work. Artists will make more or less good use of generative AI in their work, and it will probably seep into most media in some way or another, effecting them, but arts mostly don't get replaced and AI doesn't really offer an exception to that history.
That's like saying all fine art would be photography, all film would be CGI, or all music would be synthesized electronica.
That's not how aesthetics seem to work. Artists will make more or less good use of generative AI in their work, and it will probably seep into most media in some way or another, effecting them, but arts mostly don't get replaced and AI doesn't really offer an exception to that history.