China has momentum at the moment, but once that runs out there is going to be big problems here. The growth here is very superficial. There are so many deep problems that many just don't see.
The companies (private and public) and gov are way too corrupt and inefficient.
The rich-poor gap is growing wider everyday and it will eventually lead to unrest.
China lacks the resources to sustain such a huge population.
China is a sausage fest, roughly 70 million more male than female.
Many industries are sheltered from foreign competition making them weak. Internet companies for example: Have you ever used Baidu? It sucks.
The list could go on forever..