We're going to win the war on terror. Highly improbable the most powerful individual army on the planet will lose to a bunch of emo-arabs with rpgs.
That's pretty much what happened in Viet Nam.
It's like software engineering: in some cases, throwing more bodies at a problem doesn't solve it. See my signature.
We can win out by force, in Vietnam we were crippled and we could only bomb select cites chosen by Washington. The combined guerilla tactics and dense jungle is what made the US pull out, not to mention the growing lack of popularity for the war.
In Iraq they had Hussein and his sons / henchmen financing insurgency, we caught/killed them. We killed the other Al-quada leader that financed them and organized attacks. When we catch Bin Laden it will be the straw that broke the camels back. Al-Quada will collapse. Terrorism however will not be eliminated, this is why the war does not stop with Iraq. We vowed to exterminate every last bit of terrorism on the planet and goddamn we're going to do itl