Could you explain why a run on silver and gold could cause a global financial collapse?  If there's a run to cash in silver and gold contracts, supplies would run out, and there would be people left holding only paper.  That wouldn't necessarily make the paper worthless, just unredeemable, right?  Also, the central banks already are operating on fiat paper money, not backed up by silver or gold... so I don't see how a run on silver and gold could seriously harm the system.