Never say never, but I doubt I'll ever replay WoW. Did it after Pandaria was out and while questing was fun, it was also very easy. I reached level 90 in no time, but as I only finished half the zones I continued questing. But after that it was basically the same daily quests/dungeons/rep grind to gear up, even the farm you had was basically just a set of daily quests to do. Thunder Isle (or whatever the name is exactly) was fun (& hard) at first, but it too became a grind eventually. And once I got the gear it meant I had to start raiding to improve my gear.
To me it just felt exactly like before (there is a lot more to do, but it's basically the same formula). Every MMO suffers from this tbh, end game content expanding, but becoming more of the same eventually. I've had a lot of fun in WoW over the 7 years or so I played, but I just lost interest in it.