The incentives to keep it the way it used to be are gone. AI is cheap, and it sounds better than what a majority of users write.
Humans adapt. Maybe we shift from communites and moderation, to predefined rules of engagement. If a commenter can follow some pre agreed upon rules of debate, then it doesn't matter if they are silicon or not.
We went from a cave of wonders to a dark forest in a single life time. It would be amazing if it wasn't so fucking frustrating.