At least you admit that Blizzard is purposefully shitting on the "3%" (I'd wager it's a lot more), so you'll have to concede that those "3%" have a legitimate right to complain and quit.
Counterpoint: if running around on the ground was so amazing, so immersive and so gameplay-enriching, why isn't everyone doing it?
a) Because it's really not all that great as people love claiming.
b) Because most WoW players love convenience. Which also explains why they rather sit in cities and queues than exploring beautiful landscapes, whether on the ground or from the air. The point is, they love convenience, and they're going to go batshit if you take huge chunks of convenience away from them, especially if they've grown used to them for years and years. Removing flying is similar to removing LFD. Imagine that was secretly introduced. A minority of vanilla nostalgics and a disproportionate amount of people on this forum would celebrate and call it the greatest feature ever, but once the masses found out after launch, they'd go ballistic and leave in spades.
And flying has been around quite a while longer than LFD. Rofl. It's going to be delicious.