In truth is does feel like a cop out now we're at the end of mists story arch. That whole speech about how war is the bad thing here and the consequences of such a war, it all sounded like it was set up for some really deep character development in terms of who we are and what we do, the fact that our presence manifested the sha and caused such damage to pandaria.
but you know there might be another reason for why things turned out the way they did. Its because the general consensus of players in wow simply didn't acknowledge any of this, or the lessons taught in pandaria, that it all went over there heads. Blizzard saw this, realized the lessons of accepting responsilbity for your own actions and fighting for what matters to you just went in one ear and out the other for most players. And do they decides screw it, lets just go ahead with this.