China's growth is stagnate. That's why they needed tens of trillions in new debt since the great recession to juice the GDP numbers. Subtract out the $30 trillion in new debt, throw in the real inflation rate (like many governments, China lies about their real inflation rate), you get economic contraction. That means the only difference between their fake growth today, and the horrific outcome on the way, is a little bit of time and tens of trillions in additional debt that will never be repaid.
Not necessarily. 70% of the U.S. economy is based on consumer spending, meaning the disposable income has to be there in the first place. China's economy is not structured this way.
If that was the case, China's growth would be stagnating as well. Not everything is caused by income inequality.