They prepared game with flying in mind but now they are considering to not to have flying mounts as they also understand that flying can break this game. Don't be fooled that they are removing it because of us bickering on these forums about flying. We just gave them some valid "game braking" points and they understand them. If later it happens that game sucks for some reason and they will have to do smth to keep it making money, then they will add every rubbish mechanic to the game together with P2W and flying (to let it earn a few more $$ before it dies). But for now there is no reason whatsoever to risk adding dangerous and questionable mechanics from the very beginning.