Colbert gave his theory on the polt of the Force Awakens and I almost agree with it
Although I like the idea of the Rebel's/Alliance becoming just as ruthless as the Empire where a victory by either side changes nothing and I suspect
It was mentioned that the Leia and company may not be so thrilled to see Luke at the end of the movie and I believe it's because they/she were hoping the Jedi artifact would give them the advantage they would need to win once in for all and Luke basically tells them NO because they have become so much like the empire used to be.