Easier classes will be more played classes, always was, always will be.
Representation of classes doesn't mean anything. That doesn't mean that you will not see high ranked priests in the arena, and after all, it comes down to the "driver"
Doesn't even have to mean that it will always be equal, there was a time where Disco priest was op in arena, their time passed, for now, the wheel keeps turning
Who would've known that combat rogues would be more played in pvp than sub/mutilate...
It is what it is. If it was all equal and "balanced", what would people be complaining about, and what would be exciting and interesting about having all the classes performing the same...