excellent, excellent, excellent article! Thanks for finding it.
The community idea has so many advantages. I am just thinking of my neighborhood as an example. We are a gated community with a natural stream running through it on the one side, a city long forested park on another, and fenced off to every other neighborhood around it. Doing as they say and blocking off the neighborhood would be easy (albeit not hard to climb fences, even tall ones).
Just thinking about the stream. If you work as a community, you can have at least a little assurance through planning and communication that someone upstream isn't using it as a toilet (of course, outside the neighborhood is another story). There can be agreements on how water is used. Resources can be shared (sell or barter skills versus communism so everyone can benefit based on efforts).
In our neighborhood, we have everything from doctors, to teachers, to engineers. Our neighborhood also seems to have a over-sampling of retired people. What that accounts for is centuries of pooled knowledge. Most people my age don't know how to can, but my 80 year old neighbor cans peaches off her tree every year. Most people my age couldn't fix a lawnmower or refrigerator, we just buy a new one. But people my parent's and grandparent's age fixed everything.
Completely side note. I just received a nice bonus at work and plan on stocking up on 3 month supplies of freeze dried foods, grains, beans, etc I am specifically focusing on things we would normally eat. I don't want to go nuts but think 3 months is reasonable for most situations. For example, if we have a nasty ice storm next year and the power goes out for a couple of weeks, a 3 month supply of food for myself and my wife could help feed many neighbors who may not be able to get to the store. I am also buying a Berkley water filter. We have a regular supply of water but just need a good way to keep it filtered.
We have actually been eating a lot of 'Emergency Essentials' foods lately. They have TVP meat substitutes that are very good. My wife is a vegetarian (athletic choice, nothing weird) but loves meat. We found these and have been using them as a meat replacement. It is actually a lot more cost effective, it is extremely healthy, and tastes really good if prepared right. http://beprepared.com/provident-pantry-imitation-beef-flavored-bits-textured-vegetable-protein.html
I've gone almost 90% vegetarian simply by using these substitutes. Of course, sometimes you need a big, old steak.
(maybe this will be another thread).