I've seen comments from several 'specialists'. The comments range from 'he was the only person that could unify the different groups' to 'this will be a blow that will be temporary but won't stop it overall'.
Personally, I think there will be short term backlash as a result but I truly hope it sends a signal that we will eventually crush these motherfuckers. I'm going to go the optimist route and say that I think it may have a positive impact for the rest of the world as a result.
I don't think it will bring the troops home and I don't think the attacks will stop. There will always be terrorism, unfortunately.