No. For one I don't believe it will replace artists. What I expect is that we will never be able to hold wotc, hasbro, etc to this standard. Which means they'll have an even higher advantage against one-person creators
The artists working for big ones will be using AIGen to speed up their work. Same as using search engines to find info and references
Creators for which the AIGenned cover is enough, won't commission a real artist anyway
I'm afraid that such rule here ( meaning we are social network, not the shop) would skew the scale towards the big ones - they'll be getting more coverage, even here