People who are against arena are either 1.) Pve players or 2.) Really bad at arena. Wether they add arena or not doesn't really matter to me. I love pvp as a whole and just enjoy killing other players. So if it's arena or wzs I'm still gonna dominate. It is funny tho...if u remember when rated bgs was about to be added and all the bg heroes said the top arena players were gonna get dominated...yea the top arena players dominated the latter in rated bgs as well.
The point is it doesn't matter if it's rated arenas or rated warzones. If you're bad your still gonna get **** on by people better than you.