In twenty years time there will be 3 Jehovah's Witnesses in the world. Armageddon will have come and all the wicked worldy people will have been slaughtered. All the JWs who failed to meet the standard of righteousness will also have been struck down suddenly by the sword (around 7 million of them in 2008) for their unfaithfulness:
sister "lazy" didn't do enough return calls
elder "tries his best" was too lenient on a juducial committee and forgave a filthy sinner
sister "gorgeous" could not resist the come-ons from all those worldly guys
brother "horny" could not stop thinking naughty thoughs about sister "gorgeous"
sister pioneer "thinks she is an elder" kept on falsifying her reports so that she 'got her time in'
brother "prim and proper" kept looking down on sister pioneer "thinks she is an elder" because he knew she lied on her report
elder "stutters during talks" refused a priviledge from Jehovah to become a travelling overseer
sister "old faithful" went to every meeting for 55 years, but failed to confess her fornication when she teenager
brother "window-cleaner" has been sneakily playing the lottery for years to get out of his dead end job
single sister "lots of kids to bring up on my own with no help from the brothers" did not interfere when she realised that her son had sneaked off to a birthday party
brother "no friends in the congregation" went out with worldly friends from work and smoked the odd cigarette
So basically there will only be two survivors after Armageddon in 2008: elder "perfect" and sister "my elder husband is perfect" who have only been in the truth for 3 years and have not yet managed to perform any unpardonable sin yet and are going to show all the old timers how it is really done. So gleeful will they be that they are the only suvivors in Jehovah's fear inspiring and great day that they will celebrate by making a child in their own image, despite the fact that she looks as old a Sarah when she had Isaac. Jehovah was going to resurrect all those he rememered, but when he saw how wonderful elder "perfect" and his wife were he forgot all about them old princes
So that is how it came about that there are only 3 Jehovah's Witnesses in 20 years time.