The nations of the world should back the Euro instead of the dollar, as it is far more stable. The Euro is based on far more solid footing than the dollar, and the EU is simply a far better partner than the US. The Euro is the future currency of the world.
The US economy is going through a down part but overall the dollar is still more widely accepted than the Euro. The downturn in economy is not a reason to take a measure as drastic as changing out the currency all together. What happens then when the Euro goes through a slide?