China is also the most indebted country in world history, and has acquired that mantle at a faster pace than any other country in history.
http://i.imgur.com/iwarkOm.png
From everything I've seen in the financial press about their rapid accumulation of shadow debt, the situation is even worse than that chart reveals.
So at at a time when robots are set to overtake human labor, China's demographics are rapidly aging, and they lack even a meaningful social safety net - you want me to buy the bogus claim that China is about to become the next dominant economy? Not a chance in hell.
In another five years they'll likely have accumulated another $20 to $30 trillion in new debt, all going toward faking economic growth so they can pretend their economy didn't stop growing six years ago when the global consumer crashed.
Back in reality, accounting for real inflation, and accounting for their need to leverage extreme debt to fake growth, China's economy is not growing at all, and is most likely headed toward decades of Japan style stagnation - in a best case scenario.
Worst case scenario, they get old way before they get rich (guaranteed), their 400-500 million farmers revolt as their future potential goes sideways, robots take half their manual labor jobs, they stack up $80 trillion in debt (on a third rate currency that nobody trusts even today), and collapse into social chaos and revolution, as the party fails to deliver on decades of promises.
Those 400-500 million farmers? China should have maybe 15 to 25 million farmers. So they have 400+ million unemployed persons the Chinese system is intentionally holding in stagnation to avoid upheaval, because there's zero chance China can create half a billion new jobs, much less at a time when the age of robotics is upon us.