Unfortunately, reasonable suggestions exactly like yours (like your actual suggestion) has been suggested ad nauseum, but Warmane officials have stated that they are completely uninterested and unwilling to make those changes.
Obviously nobody wants the game to be one hundred percent equal in absolutely every aspect. I dont think anyone in this thread for instance has requested something like a full overhaul of every spell in the game or completely equal battlegrounds down to a single itemlevel digit. One reasonable change that a lot of people in this thread have brought up for instance could be to look over the bracketing system as right now it is either about abusing the system (which is as far as i understand it a bannable offence that nobody is getting banned for as there are multiple threads about it) by twinking the lower bracket or getting full BiS and then going human or playing in a group, usually disabling the merc mode system if you are on ally. Another could be to make FAPs completely unavaliable on Blackrock. Icecrown and Lordaeron don't have Graccus and as such it is not unreasonable to think of a scenario where Blackrock just doesn't have FAPs.
There is no simple way to just "fix" PvP, as this thread shows, but Merc mode opened a can of worms and we now live with the consequences of those worms. Until merc mode is either forced on everyone or is completely removed (which will never happen, as Warmane has stated, to the joy of the smallest realms on the server), ally will be completely dominant because the only upside to Horde (apart from RP reasons) was the shorter que times before merc mode. Everyone knew this, the entire PvP community were aware that the benefit of Human was weighted against the 23 minute ques and as such some people just went Horde to go play the game and not sit in a que.

