I like no flying in IOT and TI. Fun to quest and PVP. Takes more time to get things done? Good.
No flying seems to me to piss off gold/mats/daylies farmers mostly. I dont care about mats and gold because of my garrison will provide. Hence i will like no flying in all of WOD if they make it so.
Maybe it will suck not being able to just my flying mounts in WOD. But i wll be able in the rest of Warcraft Universe so.. no biggie.