Ok, I remember now long ago one of the devs were saying that nearer the end of mists, much like how near the end of cata they introduced transmog and looking for raid, that they will be introducing something new and big.
Now it might sound crazy, but what if blizzard decides, using both the looking for raid and real ID system, that they make the raiding and dungeon content accessible cross faction, as a kind of inline with story mechanic where the alliance and rebel horde fight against Garrosh's forces.
Would this interest people, what would be the problems with having this ingame?