This is already the case for the most part. I don't think anyone expects AI to displace "name brand" art. Low quality and stock art will become profitless virtually overnight, while artists that already make good money for original works will likely continue to do so. Your blanket analogy is apt for that reason. Human made blankets are indeed more special and people do often pay higher prices for them, but the vast majority of blankets sold or in use were made by machines at this point.