My tentative guess is that creators whose individual personality and identity are an important part of their appeal will be protected from obsolescence for the time being. Some commercial artists, like many “serious” artists, have public identities and distinctive styles that are part of their appeal; they should be able to continue charging decent rates for their work. But a lot of commercial art is anonymous, without the creators even being credited by name. Content producers will be happy to replace their work with cheaper, faster, easily customizable AI-generated work when they can.
A person starting out now as an artist, musician, or writer, in order to succeed, probably needs to put as much effort into creating a distinctive and attractive public personality as into honing their skills and producing superior work. Some creative people will be able and willing to do that, but it will be difficult for a lot of others.