Seeing what they have done so far, I think when everyone stops buying the US debt as they know they will never pay it back, there is a good chance Benny will roll out the printing press and destroy the US dollar.
When this occurs, I think there will be a flood to every other currency that is stable, eg AU, CAD, YEN, EUR. There will be a good chance that the US dollar will be replaced as the global currency and I think most liukely this will be the Euro, as nobody wants the chinese to control the markets.
Yes, the US is doing all that. But, when it comes to cooking the books, the EU are the reigning champions and it is starting to unravel on the Continent. Some are predicting the Euro will see parity with the US$. Not because of US$ strength, but because of a hollow Euro.