Right, Afghanistan, let me settle that problem for the politicians. The war in Afghanistan will end when the politicans have the honesty and the guts to say, "We can't win this war, so we're skinning out."
When they do the Taliban will fire off their feux de joie, bugger a few little boys, and slaughter anyone they don't like. They will declare that they have defeated the evil crusaders. In the sense that they are still in Afghanistan and the invaders have left they can kid themselves that they have won. In fact everybody knows that it's a conflict that no-one can win.
But there will be losers: the dead of all nations and their grieving kin; the taxpayers of the alliance of the damned; and the United States military, whose credibility as a fighting force will be Vietnam-low. Finally the poor bombed and buffeted people of Afghanistan who will be left as prey to the régime of murderous fanatics.
And Karzai will settle down in Florida, USA, among all the other failed puppets of the American Empire.
Live long enough and history just becomes a series of repeats.