As a member of what ubermensch would probably call the right wing...I'd like to chime in on this.
I agree with much of what has been said in that there is a reverse brain-drain. And also that the US is becoming weaker intellectually.
I disagree with Uber's reasons for this drain but don't need to go into that.
I do agree that China and the EU will become stronger in relation to the US. At least I hope that the EU becomes stronger. I always question the strength of their ties to each other. It seems that ethnic prejudice seethes beneath the surface in Europe for centuries and then occasionally erupts into violence. I would hope that the EU will prove to be strong enough to have a unified military force so that they can at least operate in Europe effectively.
I believe that the US may be on a slow downward slide in terms of world dominance. It could actually collapse as some people have said. In fact, I believe that financially it may be a house of cards that could collapse through terrorist action or even just on it's own. If that were to happen it would be a world-wide catastrophe that would take some time to sort out. It's hard to say what would come out of the restructuring but I think it is safe to say that the US would not have the influence it has today.