The transition to Euro's went fairly smooth for many countries. The press didnt voice TO much conflict over it anyway.
If I were to GUESS, I'd say China has to much at stake to let us fall into a barter system for
any amount of time at all. American people will resist a Chinese currancy, so I'd say China, Europe, and the most of the rest of the world will change over to a new "universal currancy" very quickly at the first sign of the dollar getting that weak. Remember, we arent the only ones in a pickle here. Other countries will be in the same boat and their governments will invite this change to. 2010 does sound like a good prediction from my seat to.
I know I should be in church right now (long story), but hmmmm. Wasn't this "universal currancy" thing mentioned in the bible at some point to?