A few classes are stupid OP, and have been since MoP hit, despite some attempts to reign them in. Do you honestly think people are going to decide against playing said classes to Gladiator in a season, in favor of playing a class that is not currently OP? Furthermore, do you think they are going to agree that Monk's are fine if they know that refusing to play them will cause Blizzard to buff them?
If anything, Blizzard should be bringing every class in line with Monks and not giving Monks ANY buffs at all.