right, that's sort of what I'm looking for. I think in the worst case scenario, we'll all end up in little tribes anyway as a survival measure. It would be better if you were already in a tribe, and it was already self sustaining and capable of defending itself. Now, if it never comes to that, then great, but it wouldn't hurt any to be prepared. As far as tribes getting large, no reason it couldn't split. that would probably arise anyway from differences of opinion/politics within the tribe. and that would be healthy I think.Thing is, that commune survived the initial couple years and is now familial, a tribe, if you will, which are pretty stable long term for small populations. When tribes get large, you end up with Africa.
I don't have time to find a better example of a community right now, as it takes time. As I was thinking about it I remember my quest a few years back to learn as much as possible about intentional communities. Most of these communities suck. If you seek them out, there are directories, and you can read up on them. most have some grand "mission statement" or something stating "where they plan to be in 5 years", but if you boil all the BS out of it, what you find is 6 people living in a single-wide trailer on an acre and a half of land with a goat and a cat, who sell beets at the farmers market. That's why the twin oaks community stuck in my mind; several reasons: amount of land, they have hundreds of acres; history, they have been a community longer than some countries; self sufficiency, there are not "off the grid", but could be at any time they wish; # of people, 100 members and counting, I have never seen another that big.