Don't like the map, and there should be WAY more 'wastelands' (i.e. death/plague zones). Basically anywhere there was a major population center, should be gone. Large portion of the east coast should be a dead zone. What do you do when you have millions of people in one area, that can't grow food, they don't have transportation out of there, and they are armed?
Almost all of them would die, and most of the rest would have horrible diseases that would spread around. California, New York, Chicago, Atlanta - gone. Midwest might do better, just by being able to get to less population density, and better farming conditions in short order. In the big cities, though, anyone left would be left because they ate the others. Not really tv-friendly, though...