The Decline of American Declinism?

When I was in grad school, Paul Kennedy's book "The Rise and Fall of Great Powers" was all the rage, and most targeted the U.S. as the next domino to fall. Obviously, that didn't happen. As this piece from Policy Review makes clear, this view that "America is about to collapse" has been around for 300 years - http://www.realclearpolitics.com/articles/2007/08/declinism.html. And this piece from The American argues that it isn't likely to happen soon either - http://www.american.com/archive/2007/august-0807/the-decline-and-fall-of-declinism.