Just a thought, but even if the initial dungeon is designed around a 6 person instance, why not make all future epic versions of quests function for raid groups?
People like raids for reasons other than loot, otherwise Tempest Spine would have never been such a success. It is inherent that sometimes it is fun to run in larger groups. So why not have all new epic quests all scaled to be 12 person instances? Seems like a cool implementation to me - and maybe would be something to help motivate those like myself that still think epic is a ******** addition to the game to give it a try.