if there is ever a major breakdown in society as is being inferred, I would stock food, water, and bullets. And by would I mean I have, although not many bullets. If you're a pacifist, or whatever, just think what happens when the grocery stores or mcdonalds run out of food, and people are hungry for the first time in their lives, thus the need for protection.
At that point gold and silver will likely be pretty worthless, except to those who think society would return to its normal.