In the matter of making facsimiles of natural objects, we now have a very similar situation with the third dimension. We can scan and 3-D print any object today and yet no-one had said (as far as I know) “…from today, sculpture is dead.” In fact, it’s possible to have a ghostly portrait head, embedded in clear plastic, made on Brighton Pier. It seems to the 3-D version of the Daguerreotype.
AI may be used to generate a painting as much as a faux photograph. It’s certainly easier to generate a digital image and then conveniently print it on a digital printer, but I can see no insuperable obstacle to generating brush strokes, or even inventing new ones, impossible to execute by hand.