Doesn't make a difference, he's been off the scene for ages anyway. Al-Qaeda just operate as a distributed force.
It's naive to assume that ending Osama will end Extremist Sunni Islam
but either way, i demand to see his death certificate.
The thing about terrorists is, they think they are right, regardless of how wrong they seem to us. Sunni muslims hate everyone who isn't a Sunni (Orthodox) Muslim, including every other branch of islam. Killing their militant leader won't stop anything, since they weren't fighting for him in the first place, they were fighting in the name of what they think is right.
Everyone should be a Sunni Muslim, no exceptions, anything else is punishable by death, <- basically this.