They already do (on itch there are already several games that use art generated by AI). This will be a trend that will gain more strength every day.
I don't think artists are going to disappear, those with experience and good skills will always find a space and surely many will end up using AI to help them in some way or another.
The vast majority of the public will consume a game because they find it flashy or entertaining and they won't care if the art or programming was created by an AI or not.