The US new upper class risk

In this post, I am refering to Charles Murray article on Times, that you can (and I advise you to) read in http://ideas.time.com/2012/02/07/the-new-upper-class-and-the-real-reason-we-dislike-them/ .

I have always looked in amazement to the US incredible capacity for social movement. It really is a fabulous asset for a society to be able to so effectively link success to merit. But, from what I understand from Charles' document, an enclosed elite is forming and it can jeopardize ability. It would be a shame and a direct threat to the US way of living if it starts being run by a group of people with limited feel and grip on its population, that can' really understand their needs and dreams and can't hear their voice in the heart.