But it is having negative repercussions.
As of patch 5.3, he' stuck killing Kor'kron in Sen'jin during the first part of the Darkspear Rebellion to take over Razor Hill. There's a negative repercussion right there, having no choice but to kill his own people, the people he used to be leading. By the end of that segment, he's off to find others who don't agree with Garrosh's views. If that doesn't end badly (aka: him getting caught in Orgrimmar by Garrosh or his loyalists), then I will be sorely disappointed. Blizz is practically setting this situation up. Frankly, I think being captured by said person you put in charge then potentially (come on raid boss!) turned against your own friends and family is a pretty negative repercussion. It just has to happen, of course lol.