Uhm of course your not bitching. If no flying at all in WoD goes live you are getting exactly what you want.
Those of us that want to fly are getting shit on ... so a bunch will quit.
Would wage it will be somewhere in the area of 2 million subs lost.
Personally I wonder if Blizzard sees WoW as a dying game. Using this method as a controlled burn to the already bleeding subs, to bring sub numbers down to a more reasonable number. So resources can be diverted elsewhere.