My optimism is mostly for increasing the number of creators of games --> best games get even better, at the cost of introducing more games, some of which may not be good. Marketplaces being the winners is a symptom of the players being the ultimate beneficiary of increased competition (and thus a surplus of both good and bad games).

I actually don't see this as an AI to replace, but AI to enable more people to create games. So ultimately, it still expresses the desire of the creator, who is human.