Earning a living through creativity doesn't work for the majority of people anyway even without AI in the picture. Creative expression is a thing that exists for its own sake, the people who make a living out of it are lucky outliers.
"So what" is that OP's children shouldn't be terrified about the prospects of an artistic career because of AI. It is not going from "good career choice" to "long shot", more like "long shot" to "somewhat longer shot".
