China's Rise, America's Fall

Via Golem XIV's blog,
Will the rise of China mean the fall of America? In a word, yes. Although decline might be more accurate.
Why do I think this? Because China is about to launch the PetroYuan and when it does the demand for dollars and for dollar denominated debt will shrink. When it does, I question whether the world will be so sanguine about the level of debt that America carries. If that happens then the value of the dollar is in question.