basically what ThaG said.
small communities will and have survived since the dawn of man.
i'm talkin bout, farming small animals, learning how to kill large animals efficiently(guns don't last forever), learning how to plant and know which part of plants and diff. wild things are edible.
i'm talkin basic survival, if we all knew basic survival shows like man vs. wild wouldn't be so popular cause it would be common knowledge.
the people, especially of united states have grown away from this traditional knowledge, and just educating yourself again could save your life.