I disagree. By definition, AI can generate average-ish work, but not new, disrupting, expressive work.
It would have never come up with cubism, magic realism, or any innovation that makes art, art.
They will improve at requiring less training data, less energy, come up with more likely possible works, polish out edges, sure.
AI can imitate, period. It is not small feat. It is a fantastic achievement that can be used for good.
By definition, AI can generate average-ish work, but not new, disrupting, expressive work.
The vast majority of people working full time as 'artists' are paid to quickly produce "average-ish" work to spec and on time. Nobody (to a first approximation) hires artists to produce capital A Art.
If you want to get semantic about it, we could say the illustator and graphic design jobs (often done by artists) will be lost rather artist jobs.