The victory of the West in the Cold War was not the "end of history" but the restarting of history.
Talk about blowback! Maybe instead of obsessing over whether we should have left Saddam Hussein in power as a bastion of (regrettably) brutal "stability," we should be wondering if we should have backed Mikhail Gorbachev in remaining ruler of the Soviet Union and Warsaw Pact!
We will remain the most powerful nation--if not the dominant one, yet with more deployable power--with no sure end in sight, I think.