Do people really believe that China will on its own, adopt a gold backed currency? Does anyone realize the implications of the global economy for sucha move? I'll give you a hint, China isn't selling, or buying any goods internationally including from its trade partners if such a move is adopted. Only a concert effort of several nations to reject western fiat currency and adopt a similar measure of their own woul dmake this move even feassible.
Then there is the whole exchange rate to figure out based on what is currently in rotation of currency, what the exchange rate, if any can then be, what method of anchor system to develop and a host of other complications that make this effort feaasible. The only power currently in position to make sucha move is the US and that will never happen. Because it takes away the ability to print out of no where and devalue a currency. It's like the float that occured following 71. Only in reverse.
It wont happen unless the perfect storm arises. If China is holding out on a dollar implosion, which would cause international financial chaos, then that makes sense to soem degree. Except we buy most of their goods.