Well-put, Zoiks. Reminds me of the Kingdom Melody song called "Then They Will Know"--a nice little ditty preemptively gloating over the destruction of God's perceived enemies.
I think most JWs don't really believe that God is going to kill all non-Witnesses. I know that I didn't believe that. Most of my JW acquaintances don't, either. They say things like "he will read hearts at Armageddon." When I started thinking about this, it cemented the idea of how pointless the JW "preaching work" really is. I've had Witnesses admit to me that the preaching work is really no more than busy-work. It's how we prove to God that we're obedient and want to serve him.
So, yes, the doctrine about who is going to survive Armageddon (which is "imminent," by the way ;) is definitely one of the soft spots in WT/JW theology. While the WT almost never comes out directly and states that you must be a JW to have a chance at surviving Armageddon, they constantly talk about the "life saving" nature of the JW preaching work. Pick up any Kingdom Ministry and you're guaranteed to see at least one reference to the "life saving" work.
So, if it's truly a life-saving work, doesn't it logically follow that the lives of people who don't respond to (or aren't reached by) the preaching work are not saved? I don't see any other explanation. And then doesn't it follow that those whose lives are not saved will die? Otherwise, what does it mean to have your life saved?