I am not entirely sure china will burst, but it is definitely leaning towards it. They have an extremely corrupt system that, between bribes and influence-traffic (don't know if you use that expression in English
) is increasing the costs too much, on an almost exponential rate. I read this article on the New Yorker a while ago and it got me shaking my head. It definitely can't last forever. Add to that the unrest and you have a brew for trouble.
The only thing is that with China, you never know if things haven't already exploded. Take the issue of the real-state bubble, which makes the abandoned cities of Spain look like a joke. Half the time in China you can't really trust the data because it is completely controlled by the one, single goverment. At least in Spain our greedy two parties are busy enough trying to uncover the other's corruption for some truth to emerge from time to time 
On the other hand, I can't be sure of what will happen to China. Will it be a giant with feet of clay? Or will it go through a crisis more on the style of America's 1929, leading to a recovery and etcetera? One thing is that you stop growing a 20% per year (that obviously will end) and another is that you stop being a world economical and political player...