They have $1.3 trillion in fx reserves. The U.S. by comparison has something like $69 billion. They have 1.3 billion people. The U.S. has 300 million. Their economy will pass ours.
Oh, by the by, Andy is a potato head.
Could this happen even more quickly if Chinese web 2.0 entrepreneurs start carving into the broader world/US/European market faster than anticipated?