Don't believe the hype about the decline of America and the dawn of a new Asian age. It will be many decades before China, India, and the rest of the region take over the world, if they ever do
Even in a multi-polar world where China actually has more military power than America, we will have the greatest amount of free power to throw into any fray.
When I look to the future, I'm not terribly worried about our position.
This doesn't mean we shoulc be complacent, of course. I bit of worry looking over our shoulders could do us a world of good.