Of course rogue/priest is a "staple" because it's so OP...and nobody is saying you can't queue as rogue/priest - but if you do, you will fight other healer/dps teams only. What's wrong with that? Are you saying you rely on an OP comp to win?Additionally, this is almost like a penalty for rolling healer/dps, which has been a staple (rogue/priest) since season one. It's not the fact that players want to play healers or tanks, its the fact that Blizzard can't balance this game because of the amount of crap they have going on. 33 specs to balance around both PvP and PvE, it's enough to drive one insane.
Obviously, blizzard felt that arena matches were dragging out too long due to healers and/or tank specs being so difficult to kill with so few DPS. They added this "crowd chooses you" debuff which is basically a penalty for playing a squishy class with no strong defensive CD - like my enhancement shaman. It's a bandaid that does not address the root problem - healers, and to a lesser degree, tanks do not belong on 2v2 arena.
Since everyone has the option to gear and roll DPS regardless of the spec they play, nobody would be alienated from 2v2 and they could get rid of that debuff.