Of course, anything can happen, but these domesday scenarios are very silly. The collapse of the dollar would have worldwide implications, starting with china and the entire world energy market. That isn't something that is about to happen overnight. The US economy is currently at more risk from deflation than inflation (see japan). It's difficult to imagine a scenario that would take it from it's current condition to high inflation. What do these guys want the fed to do, ignore the current conditions, reduce the money supply, and drive up interest rates?

I assume that this nonsense is a response to the fed putting some cash into circulation, maybe they should all go buy gold at $1400 and see how that works over the long term (talk about bubbles).

Besides, in the type of scenario these folks are imagining (complete worldwide economic collapse), the value of my dollars would be be the least of my worries. This is nothing but fear mongering, and if you look behind it you will usually find someone trying to sell something.