Imagine someone taking your car away, simply because it allowed you to get to places more efficiently than riding a bicycle? They are contemplating this because it allows them to greatly slow down the player base. Holding onto someones belt as they walk up a hill, so to speak.
For those arguing that all flying should be removed, how about you exclusively use your precious ground mounts you love so much, and let the people that prefer to fly, fly?
I agree with the comments regarding Blizz selling flying mounts for genuine cash, then mentioning their removal. People spent money on them, or grinding out mats crafting these mounts. Saying that they can be used as ground mounts as well, is the same as saying your car still rolls, push it and be happy with it.
I think I have finally outgrown this "suffocate" design philosophy.