Wise words, but even Sun-Tzu could not anticipate an enemy without a will to live, or more importantly, a willingness to suicide. He assumes they will retreat when given an opening, but we cannot assume that any longer. They must be wiped out.
The bin Laden cadre may have a willingness to suicide, but they depend on people less fanatical to give them a safe haven and provide logistics, money and intelligence.
Also, I doubt that their command and control have the same suicidal fervour that they have instilled in their shock troops.
We have dealt with kamakazi before.