I'm not sure modern cities work for that though.
It is pure guessing at this point.
Self organized social community isn't that hard, given the right factors it's an inevitable emergent behavior. All we needed was a shared space to inhabit and time spent in proximity. Order and non-commercial community relationships spontaneously resulted, you wouldn't be surprised if a bunch of random fish from the same species dumped together in a tank started schooling, human sociality hasn't evolved out of us yet either.
I'm not saying everyone will do it, I'm not saying that people who grew used to social isolation over the last few years will ever participate, but we aren't so removed from the tribal/village time period that those evolutionary tendencies have been weeded out. Dunbars numbers and all the extrapolated implications still hold in my experience.
Speaking to point 2, I think it's likely that with a large number of people no longer feeling work stressors, we will gravitate towards meatspace small communities not substantially different from tribal communities or villages.
Those models of living were both very successful during periods of human existence when there were fewer hours devoted to labor.
The outputs from those communities will mostly just be self existence and social cohesion.
There will probably be a renewed interest in philosophy, theology, math, chess or other stimulating intellectual pursuits that have no direct economic stimulation. I think it will actually be a fantastic time to be an academic.
Many humans are very good at avoiding boredom through intellectual or artistic pursuit and for the rest there is neighborhood gossip and/or skydiving.