Sorry, but I disagree about gold/silver being worthless post SHTF. Gold and silver have always been highly valued, and always will be. I had a mining partner who once found an spear point hammered out of solid gold. It was estimated to be hundreds of years old and made by a tribe of Indians who had no idea of money. They just knew that gold made great tools, and great trade items.
I do agree that a person wouldn't want to put too large of a percentage of their preps in gold/silver. But if one can afford too, I'd recommend holding pre-64 silver coins and small size gold coins; in 1/10, 1/4, 1/2 and 1 ounce sizes.
I also think that if there ever is a truly world wide disaster, that it's foolish thinking, and somewhat insulting to Man's intelligence, that we'd never recover. Sure, it would take time, decades maybe, but I have more faith in Mankind than to think it would be all over.
Too much TV and disaster novels can be a bad thing....