This seems much the same view as Pat Buchanan has been expounding for the last ten years. Mark S. seems to have written off Europe--or at least most of it. It will be interesting to see if a major backlash develops on that continent to the Islamic tsunnami. Certainly the left doesn't seem capable of self-preservation. The US might be the lynch pin, but it might take a new civil war to achieve a non-suicidal society.
If a backlash to the Islamic tsunami is to occur, it will take Europe (and liberalism in the USA) abandoning many of its core values--I don't think that will happen.