Interesting article. Connors was a true legend. BTW, he did play against some really great Europeans (ex. Borg, Becker, Wilander, Lendl), and I'll admit Borg beat him like a drum. It's tough to compare players in his generation to the ones we have now. When they were in their prime, Borg played with a wooden racquet and Connors played with a T-2000.
I think I see his point when it comes to American players. I see a competitiveness in Federer, Nadal, and Djokovic that I don't see in any Americans. It could just be because Roddick, Fish, Isner, and company just don't have the talent that those guys do and since they can't compete at their level, killer instinct is irrelevant when they play them. Eventually, another Sampras, McEnroe, or Connors will come through. It's just going to take some time.