If the us dollar was going to be replaced. What with?? China who would sell their mother to get what they want?India that is still a third world country and couldn't hold a decent commonwealth games.
There is no ecomomy big or diverse enough to measure currency exchange.
The EU made a big mistake with the euro. If just one of those major countries hit a recession it would effect all the EU countries because of the euro. When the euro first hit the markets I saw trouble coming.