70s went from amazingly active in Cata to dead in Pandaria idk why. People quit for the new expac and never returned, I guess.
we had bgs in MoP not that long queue times. i wouldnt call that dead. and i even formed a bg here in WoD that means we have MORE than enough people to do bg if i recall correctly we had 20+ hordies queing up and 10 allies. and i bet theres ALOT more allies that i didnt have on Btag..
the bracket aint dead yet. and it wont be anytime soon.