One of the points I was trying to make with my last post , ties in with Robs, moving in chaos comment. The type of preparedness we are discussing here is not possible for large portions of the population because it is not some thing you plan for "In case", it has to be something you live every day, like the Branch Davidians, or what the Hippies were attempting to do with their "communes" back in the 60's. Second best choice would be a small rural community, If you and your neighbors are already supplying your own plants and animals for food, hunting, fishing, and practicing usable skills through your hobbies the worst crisis that can hit would be the end of outside medicines and coffee, depending on your area of course,(are there sugar beets, sugar cane, or maple trees in Texas ? ) up here I can't think of much that can not be produced with a little prior planning.
As for BM's tale, that's less likely in a more isolated community where every one knows every one else, Barn and house raising's were an American tradition in small towns well into the 20th century and every one helped because their own place had been built the same way.