If AI completely eliminates low skill art labour from the job pool, it's not like those affected by it are gonna disintegrate, riot, and restructure society. They have the choice of filling an art niche an AI can't or they can spend that time learning other, more in-demand skills. This also ignores that fact that some companies would rather reallocate you to more profitable projects even if your art skills don't change.
Selling a product with relative value like a painting or a sculpture will always be an uphill battle. Now that there's more competition from AI, it just gives artists/businesses incentive to find what people want that an AI can't deliver. Worst case scenario, employment rates in this sector are rough while the market recalibrates. Interested to see how these technologies develop.