Originally Posted by
savutitus
Actually, I think something like this is about to go down: We kill Garrosh, and we spark a civil war among the Horde as hundreds of power-hungry people want to claim the title of Warchief. Sylvannas quickly seizes this opportunity, and dispatches her Forsaken full force into Orgrimmar, so she can claim the throne. She is stopped by the other leaders. Sylvannas then leaves the Horde of her own will, claiming the the Forsaken no longer need the Horde having outgrown it. Of course not all of the forsaken agree with her and so a part of them chose to remain in the Horde under leadership of Koltira Deathweaver (or someone else). Sylvannas leaves to follow her own agenda ultimately resulting in her death. The other leaders come to a conclusion that a divided Horde cannot stand, and thus form a coucil, comprised of all the Horde leaders: Vol'jin, Baine, Lor'themar, Thrall and Koltira (or whoever is chosen to lead the Forsaken).
I know the whole council thing is just an Irongforge rip-off, but I can totally see it happening.