Malgus I agree that in the rural areas gold and silver will be a good thing since you can grow food or live stock. But in the cities were I am food will be the king in a SHTF. I think the first two to three weeks people will sell you food for it till they find out that there is no other food then gold or silver will not be good. They would have to go to the rural areas and exchange gold or silver for food.
After the SHTF gold and silver will become king again. But when everyone is dieing in the cities no one will give up there food for gold when there is no more food to be found. So agree that once it passes gold will be king.