Please read this and then take 60 seconds to critically think about this statement:
An argument is not invalid just because you disagree with it.
This thread has become so unproductive. People have a right to their opinion, but Blizzard literally said in their forum post:
It’s not totally conclusive that same faction BGs won’t cause ripples in faction balance, but there is evidence that the THEORY and concerns are proving to be false. The first bullet point actually highlights that despite faction balance being skewed in favor of horde players, it is not having a major effect out in the world. By giving horde access to faster BG queues alliance loses nothing per the initial data summary.
You can keep trying to win the argument, but I don’t know how you can refute what the company that has all the data is telling us. They have no reason to lie about this. They make more money if more people play the game.