Although funny, this is not a very effective command:
20000 meters above sea level, that will take several minutes to fall to the sea, the player would have just used /kill and just respawned, no one is going to wait that long.
Given what I mentioned in my first point, you might as well have teleported to player to 0 0 9999999, or even better, just use !kill on him/her, there is no need for such a command.
From what I can see, this command only differs from other methods by the fact that it is made to "piss off the player", not good when your trying to teach someone the rules.