I would ask that you reconsider your worldview. Its quite natural to speculate on the demise of the Superpower, because by its nature it is the Country that gets a lot of attention. This doesn't mean that a majority of the non-US peoples are actively rooting for its demise (maybe they are? Its an assertion that needs to be validated, perhaps with polls).

> It's why the never-ending expectations of our national demise and erosion, going all the way back to our formation, have always turned out so embarrassingly wrong. They're wrong now as well.

History has shown us that nearly every civilization that flourished and prospered also managed to vanish over a really short period of time. Societies are a lot more fragile than you would believe. American success is not based on some jingoistic manifest destiny; it is a country that has managed to get its fundamentals right. However, even the best prepared civilization can collapse in short order; its happened before, and there is no reason to believe it won't happen again.