Don't over under estimate US$.

US$ problem looks big at surface. But it better than you think. Why the US goverment has so much debt? Because US goverment can't print money. If the US goverment can print money like Chinese goverment did, they will not have any debt. The devalue of US$ can reduce the US debt burden and increase export. But it's the Fed's responsibility to keep the US$ stable. If China want to dump all the US debt and help to devalue the dollar, the US can actually benefit from that.