A few things. A web of trust of some kind like vouching may come back, and general algorithmic silencing of low quality members. Also most governments are going towards the South Korean model of government-verified ID to post online to keep teenagers off social media. The same tool can be used to greatly reduce spam and slop, if that's what platforms want.

Also people will get used to AI in online spaces as AI quality improves. If I'm online trying to get help for some task, I personally don't care who wrote what if it is correct; it's not like humans have great track records of accuracy or substantial contributions either on average. Correctness is expensive in general.

If I'm online trying to relate to other humans emotionally, well I get what I'm paying for. It's been true forever that the better the gate, the better the community. I've tried to push the boundaries of openness, but as I've written extensively on MeatballWiki, soft security depends on there being more good than bad apples in a community. With machine intelligence, the economics of that are silly.

Regardless, people love people, so we'll figure it out. I'm optimistic we can rise to this challenge.