Removal of LFD and LFR would kill it for me. I play on a pretty dead server, where it would be damn near impossible to organize groups of random people even for 5-man content. I would actually quit playing if they removed those, because short of transferring, there'd be nothing for me to do.
I do kinda like some of the ideas in that list though. I'd be pretty happy if they removed CRZ and brought back some of the class-specific quests (warlock minions, class mounts, etc). I'm fine with world PvP happening on a PvP server, but I think CRZ took it from one extreme to the other. It would be nice if questing in Hellfire Peninsula were possible again (without requiring me to log over to my level 90 every minute or have an army of level 90 friends to guard me).
I just thought the class-specific quests were fun and gave classes a little more identity. I really enjoyed the warrior Cyclonian/Fray Island quests and the warlock minions/epic mount quests.