One of the problems with the bet is that you are betting in the opposite direction from Soros. China can just print more Yuan, and suddenly Yuan decrease in value. Add to this the ridiculous levels of pointless internal investments, seemingly done to inflate China's GDP. And finally, there are severe problems with Chinese equity markets that make it scary to bet on Yuan against USD.

I think at some point in the future, China will stop having an export economy, because advances in manufacturing technology and automation will obviate the need for cheap labor. And at some other point, China will start investing sensibly in internal matters. I have no idea how to translate this into USD or CNY, but if I were in China, I would want the transition to happen gradually. A gradual transition avoids destroying the manufacturing sector overnight.