How will this solve the issue that horde gets rekt most of the bgs and that there is a HUGE gear difference between the servers? As lordaeron Horde player mercenary mode can only make the problem worse, there is just no way that it changes anything to the better. BiS Humans get faster in bgs, but I am sure that there'll be some people whining that not every bg is a free win anymore since they might face BiS Humans instead of horde players themselves.
With this change I might play a bit of bgs on blackrock alliance again but I will have to give up the last hope to ever get a good bg as lord horde player ever again