1. If 'art' is expression, then it should be judged by the 'quality' of the expression, not the tools used to make it.
2. Most 'commercial art' is made to a spec generated by a customer for a specific need, not for 'expression'. Future DALLE variants will do it faster and cheaper (arguable even better) so that will be what is used regardless of the philosophical implications. Artists are not going to be needed to same extent as today (we already saw this with clip art, public font databases, and gig sites). The economic impact will be the same regardless of your interpretation of 'art'.
3. I am sure There will still be famous and acknowledged 'artists' known for their ground breaking work regardless of what tools they use. As an analogy, There are still companies that make shoes by hand, they are just an expensive luxury.
I am guessing we will next see article from a translator about how automated translations system lack the innate 'sensitivity' to the human condition to be used in professional translation (it's true to a certain extent - for now).