The fall of the American Consumer

The U.S. consumption used to cover about 20 percent in world economy. But now it drops to about a half. The consuming ability of Americans is not as usual since the financial crisis. Now the U.S. government wants less import but more export to other countries in order to help the growth of economy. The tipping point of global economy is that every country wants to grow more by importing goods to other countries, but no one wants to do the purchasing. Since the U.S. is sure not to be the biggest consumer next decade, will other countries like China or Germany replace the position?