This guy has an interesting take on it. Basically that it's too complicated, just give up and take care of yourself.
http://survivalweekly.com/1675/the-s...ommunity-myth/
I think if such a community were built with homes and community set up as I outline, the rest would take care of itself.
As for when do we start? I dunno. Some day I'll track down a developer and see if something like this could be built, and how much homes would have to cost. Developers are going to be about making money, so you've got to present it to them that way. If it's a money-making proposition for them, they'll build it. Or someone will.