The Blood Elves had their famous leader as a Raid boss as soon as they came out.
The Forsaken killed Saurfang Jr, and Bolvar in a sneak attack on everyone.
Thrall left the Horde to join the Earthen Ring, and that turned Garrosh into a Raid Boss
Cairne got killed by Garrosh by accident
Vol'jin got killed by a random mob while in a raid consisting of every major Horde character
Sylvanas looking for any way to secure the Forsaken will probably be a Raid Boss
We've also killed off every possible force that could have allied with the Horde, the Amani, the Drakkari, the Blackrocks, the Gurubashi.
Meanwhile the Dark Irons are on the council of the Three Hammers.
Who the hell is left for the Horde? Ji Firepaw and her 50 monks? I can't decide if the Horde should stay together out of survival, or if they should disband because even when allied they kill each other. Either that or they are too incompetent to be a faction anymore.