Socialism is bankrupting the countries of Western Europe. Now that the Constitution has been rejected, individual countries may start their printing presses again (France, Germany and others already have incurred deficits over the allowed level). This will drop the Euro's value compared to the dollar.
Well it looks like the Americans have been priniting more recently. Okay I am not from the EU so I am neutral here.
Anyway in the year 2020 the Chinese economy will be the biggest. Later the Chinese economy will become almost as big as the US and the EU economies togheter. Maybe the new reserve will be Yuan. Just a thought.