Like I've stated many times; over the course of Cataclysm and Mists of Pandaria, World of Warcraft is 5 million subscribers shorter. You cannot argue the fact that this is a result of one simple fact. That fact is there has been more negative developments than theres been positive. As a result. Blizzard is firmly and nicely making several change of directions. Not flying in the relevant world just being one of them
If you refuse to acknowledge this, then that is nothing more than you being stubborn and refusing to let go of something that obviously means a lot to you, but you're fighting a lost cause, it is time to let go and move on. Blizzard has bigger concerns to deal with at the moment, how many players are affected by having to gather 20 people for raid rather than 10? They fight a far bigger argument then you do. And they won't back down on the change to 20 man, so why on earth would they back down on something that affects an even smaller player base?
It's time to come to the realisation that you're fighting the bigger power here, there is no way to get this specific matter through. It is over, the decision is made. Obviously if their plan is to implement flying in 6.1. There wouldn't be a 315 page thread on mmo-champion discussing the matter. That is terrible PR for Blizzard, they wouldn't want that.