I have some hope that the current crisis is at least half over. The fog of war keeps us from knowing the enemy's capabilities. The uncertainty of it all is more scary than the actual danger. You are more likely to die in a car wreck, but at least you know the odds.
How will it end? Sooner or later we'll have to negotiate with the Taliban. The Continental Army did not kill every Loyalist, the Union did not kill or capture every Confederate, and there are ex-Nazis resting comfortably in German retirement homes. We'll bring the troops home. If we don't get attacked again, we can call that victory. If we do get attacked again, we'll reinvade.