^As far as retaliation goes, it's not a question of probability, just a question of time. There is a long line of "heirs to the throne", as it were, within Bin Laden's organisation. Killing Bin Laden surely changes nothing, he is just one man after all.
As for the USA "winning" because of this, my deduction leads me to believe that the score is: Al-Qaeda 2,752 - USA 1. That's a joke in pretty bad taste, I understand, but regardless; for anyone to think anyone has "won" anything... well, that truly is a joke in bad taste.