The Darkspear Rebellion

Which is where the Darkspear Rebellion comes in. This wasn't a sudden decision on Vol'jin's part. If it had been, he would've done it the moment he and Garrosh exchanged heated words, shown in a brief scene to new troll players. He wouldn't have threatened to kill Garrosh, he would've simply killed him point-blank without waiting to buying wow gold see what Garrosh would do. He wouldn't have given Garrosh the opportunity to command any kind of loyalty, or build up an army of Kor'kron wholly devoted to defending the Warchief. Instead, Vol'jin made a strategic retreat to wait and see, hoping that Garrosh would somehow prove himself again. And Garrosh did -- he proved to the Darkspear, and to everyone else, that he only had the best interests of the orcs of the Horde at heart. He proved that he cared little for the other races of the Horde. He proved that he would take whatever ruthless, bullheaded moves he had to make in order to ensure the Horde's survival -- to where to sell wow accounts ensure the orcs' survival. As far as Garrosh is concerned, the rest of the Horde isn't really worth bothering with. It was apparent to Vol'jin right away, and perhaps in a way to Baine as well, but it took time for the others to see it -- Sylvanas witnessed it in Silverpine. Lor'themar and the blood elves didn't really witness it in full until patch 5.1. The goblins only just witnessed Garrosh's true opinion of them in the patch 5.3 scenario, Dark Heart of Pandaria. Vol'jin would not have had the support of the other Horde races behind him, had he killed Garrosh back in Cataclysm -- and in his own way, he likely knew that. He certainly has their support now.