It will become a warlord society with armed gangs taking what they need in large cities anyway. So, let's hope that it never gets to that point. But, the more dependent the population becomes on large urban areas, the greater the impact that anarchy will have on the land.
The country folk will survive.
Hank Williams, Jr.: A Country Boy Can Survive
http://www.youtube.com/watch?v=I4s0nzsU1Wg