If you had a choose a currency which one would you favor? The dollar has problems but it seems the EURO has more. The dollar has been around and accepted for an awful long time, the EURO is fairly new.
If inflation gets out of control dollars can still be used; it'll just take more of them. In the late 70's and early 80's the inflation rate exceeded 20%. We are far below that now.
If deflation takes hold dollars become more valuable.
I'll go with the dollar...and the Patriots over the Dolphins.