There is a distinction between the flailing Chinese stock market and the RMB

Such is the current financial woe in China today that value of is stock market is down some 30%.
However, its currency, its RMB remains stable. One of the results is this:

http://en.people.cn/n/2015/0810/c90000-8933827.html

The result is that the US dollar has a competitor as the trade currency of the world.
Once this standard was the UK sterling. Then the standard was passed onto the US dollar. There is a new kid on the block, the Chinese RMB. 
If the Chinese RMB is ever invested with the status as the number one international exchange currency, that day will be quite financially earth shaking.