This should not be a surprise to anyone who really understands the data. The trend is decades old (not just the last seven years....).
China is what? - 1.2 BIllion people - of course their economy, if at all healthy, should, at some point, be bigger than ours.

Among many, many regulatory reasons for moving manufacturing and other GDP creating activity out of the US is the big corporate tax
rate ("penalty") for creating/manufacturing domestically.
Recent accusations by O of this being unpatriotic is a example of how far we have to go to fix this - progress on a solution does appear beyond political will / vision. (again nothing new for decades).

Regardless, I have no fear of China's "communist power". They are not a significant military power - all their foreign policy effort is effective, low cost natural resource acquisition and domination.
My fear continues to be of our own governments restrictions and roadblocks to growth and prosperity here domestically.
Our "leaders" are so lost on the focus of breaking all our legs, and getting a monopoly on crutch distribution, that they have no vision at all on growth and freedom.