I'm not sure the dollar would be around long enough to hyperinflate. Too much of the world relies on trade with the dollar. It isn't like Venezuela - nobody really cared about their money and didn't rely on it for anything (other than the Venezuelans). We won't see people wheeling around wheelbarrows of dollars.

I think if the dollar does crash it will be over a 2-4 week period while the world adjusts to trading with BRICS currencies, or they will just go straight to Chinese, Russian, or European currencies. The rest of the world won't wait while the dollar goes to fractions of a cent.