@JayHawkFanToo
Because China has been in its current form (geographically, at least) for centuries, it is far more stable than the former Eastern Bloc ever was.
This long history also means that, ethnically, China is actually quite homogeneous. The Han-Chinese make up over 90% of the population. While China is linguistically very diverse (nearly 300 languages, probably twice that if you include local dialects), most Chinese speak Mandarin (about 70%). Based on that, more than 60% of the population is both ethnically and linguistically united.
Simply put, it is unlikely that China would break up even in the event of a revolution because of its longstanding historical borders. Many of the subgroups are so small that it would be difficult to break off into a separate nation, particularly for those that would be entirely surrounded by mainland China.
I think those factors contribute to actually stabilizing China substantially. Even in the event of a change in governance, China would probably still have a population over 1B, making it a substantial world player either way.
