I think - and at this point a guess is all we have - that Obama has greater mental flexibility than Bush/McCain on the subject of foreign policy. Read: He'll be able to understand and more or less accept when a country has clearly and unequivocally left the US sphere of interest.
Bush/McCain seemed to have no willingness to concede loss of territory. And if you have a major power trying to enforce its will on what is clearly another major power's turf... Bad Things Happen. Think Georgia or Lebanon. Or a Chinese invasion of Taiwan, for that matter.
Yes, a US empire that flails out desperately at a variety of lost causes would weaken itself faster than a US empire that cuts its losses and manages more or less orderly retreats from its former colonies... But flailing about would hurt a lot of people on the way.
- Jake If you only spend 20 minutes of the rest of your life on economics, go spend them here.
See, the rest of the world doesn't want a competent imperial manager for the US. We want an incompetent one, because such people are easier to beat. Bush, being a fool, did immense damage to the US imperium. I hate the US imperium, and I hope to live long enough to see the US itself reduced to the point where it is accorded the same international interest and respect as, say, New Zealand (i.e. pretty much none.
By the logic of this argument, we should all have been rooting for a Palin Presidency. The problem is that if the US is reduced to the influence of a New Zealand, the likelihood is not that we will have lots of New Zealand type countries in the world living in peace and harmony with one another, but a world dominated by China, Russia, Islamic countries or multinational corporations of no particular national loyalty - something which may be happening anyway.
A uni-polar world order leads to unparalleled hubris and arrogance, and I a glad that era is drawing to a close. But a multi-polar world order -in the absence of strong International legal institutions - could be even more unstable. We have to be careful about what we build to prepare the unipolar system - and the cataclysmic decline of the US is not guaranteed to give us a better world. notes from no w here