Quote:
Night gathers, and now my watch begins. It shall not end until my death. I shall take no wife, hold no lands, father no children. I shall wear no crowns and win no glory. I shall live and die at my post. I am the sword in the darkness. I am the watcher on the walls. I am the fire that burns against the cold, the light that brings the dawn, the horn that wakes the sleepers, the shield that guards the realms of men. I pledge my life and honor to the Night's Watch, for this night and all the nights to come.
To "liberate the north" is to break these vows. Breaking these vows is betraying what it means to be a Stark. Given his show clash with the WW -- it really doesn't make sense for him to turn his attention to the realms of men regardless of what happens. None of that is the real war. Unless he's forced with Ramsay backing him into a corner with the threat of annihilation from the south. And IMO there's a decent chance the NW doesn't exist anymore when he comes back. WunWun is about to wipe out Castle Black for that little mutiny. It was just stupid on their part. Might as well have stabbed Stannis while he was posted at Castle Black if the goal was to commit suicide to the whole castle. For Jon to ever actually hold the north -- he also has to usurp Bran and Rickon -- who Jon has a very good idea are still alive through their meeting with Sam and coming into contact with one of their direwolves.