Yub, the best solution would probably be a "dual system". I am really curious if it (ever) happens, since there is a strong lobbying influence from the US.
Asien countries are also adjusting their currency reserves for some time now, buying Euros. For sure, if China floats the yuan, we will see some shockwaves imho. They try to make it smooth, but I have my doubts. And as longer they wait, as tuffer it will get.