People that rage quit don't care about stats so deranking them would literally do nothing to stop it.
Kids quit because they don't get revived when they have a good weapon.
When they don't get a shovel.
When they don't get the ''Jet Gun'' thing on Buried.
Kids rage quit because they are brats. They do not care about their ranks. They do not care about their in game stats.
They just want to live forever with good weapons and if something stops that, they will quit.
Deranking is not the answer.
The answer is reverting the leaderboards to Black Ops 1 leaderboards.