Come to think of it, could seven million people really handle the cleanup and burial of almost 7 billion carcasses strewn about all over the world? The WT teaches that perfection would be gradual. So they would still be able to contract deadly diseases from our rotting apostate bodies as they attempt to bury us all.
Add to that the fact that they wouldn't likely be allowed to use any heavy equipment for excavation or transportation.
Why didnt I think of this while I was daydreaming at a meeting?