I think I'll manage not to care, it's only going to be special people like GTX that will actually brag about such a rating, and they are sad anyway. I'm sure most people will just carry on like before.
You mean wear heavy armor and run in circles?
I have another suggestion, or addition to existing suggestions:
You defeat a guy, you get his rank, his new rank = old rank +1
Example: Teeth rank 20, I duel him, me rank 20, he rank 21.
That would be make way more sense than the current system.
With the current system a player could simply avoid duels with players he knows that he cant beat, and duel only players he knows he will beat for sure, and this over and over again.
Also, refusing a duel should auto-kick the player out of the top100.