I'm more concern with the euro than the USD. I bet many europeans will end running to the USD again because of problems that still exist.
Do you remember ho many times the so called financial experts have said that the euro won't make it to 2010 , 2011 , 2012... and in the last few months they have gone silent.
The euro is here to stay and I think it will even survive the fall of the $ (if this will fall , which i doubt).