So it's time for yet another expansion where we have to solve all the universe's problems and bemoan the inability of our faction leaders at doing any work themselves.
However this time there's really no excuse for our faction leaders to have to call for us. Now that we can connect to different times (any low-ranking bronze dragon has the power, see Kairoz) why don't our leaders just open up links to different universes and grab a copy of themselves, their followers and armies to fight the Iron Horde together? I mean you could go to 1000 different worlds, grab a 1000 Thralls and 1000 Orgrimmar Hordes and have an army that would dwarf the Burning Legion. Then you could conquer the entire universe and stomp Sargeras himself.