I would love it, but with the way the game is designed now, it would be a pointless return.
They would do one, two or even all of the above:
A. Make the Elites not powerful enough & people would just group & face-roll.
B. Elite Creatures for the quest would most likely be completely out of the way in some secluded place adding 0 Danger to the world because Blizzard wouldn't want people getting angry because they randomly come across a camp of elites.
C. The current WoW Player "Queue" mentality would cause most groups to do the quest in utter silence with the only conversation being, "I'll come, DPS". Sure this does not apply to everyone but I can see this being the majority of groups.
D. Blizzard wouldn't want to FORCE the Group Quests on anyone (So to not piss off the morons who like to view WoW as a Singleplayer Experience, which honestly is mostly Blizzard's fault by enabling that in the way they do Questing these days) & in doing so they would probably not make the Rewards (XP/Gear) as valuable as it should be & it would end up not being worth people's time anyway.