I wait when game from like Dark Souls series is released and all concept art is generated by AI, to me it seems such game will have no style consistency, it will look like game that is is put together from market place props (eg. cheap garbage).

Because AI can generate very good looking art works, I don't think it is all there in making compelling, consistent, and visually pleasing art, simply because there are feed back loops, between multiple people, from concept art to end product.