[roenxi]

How many advantages does America have left if China gains a decisive edge in its research capabilities?

I count military and control of the international monetary system. That isn't a winning hand unless the Chinese shoot themselves in the foot with corruption or a return to their communist roots.

[yoube]

English is a huge advantage. I don't see the rest of the world clamouring to learn Mandarin any time soon. It's a benefit, sure, but not a necessity.