I think "communities" come together for purposeful activities ... in today's world most purposes are for projects ... just like most work in most organizations now (and increasingly) is related to projects. Thus, of course they rarely last too long ... but I suspect that we will be able to see threads of evolving purpose as communities keep moving, and eventually fractal patterns of human activity. Dave Snowden recently told me that there is deep research going on into that exact topic (so I felt somewhat validated at what was for me sort of an intuitive insight).

A perfect field, I think, for wirearchies.