Your problem is that you only think in dollars. If the Euro can double in value against the dollar in a few years, then the Yuan can do several times that amount. Indeed, it has to if the US and Europe are ever going to be able compete against the Chinese.
Yes, the stock markets in China are melting down, but only because they fear how bad things actually are in the US. The only people who cannot smell the fear are the Americans. You think it their problem, well yes it might be but only to the extent that they are going to be modestly affected by your problem.
If you think the Bush stimulus is about anything other than trying to rescue the election, then you are dreaming.