Bran Stark has seen what happens when men and women play the Game of Thrones. Even before his ascension he knew the human cost of war. He knew the price the little folk paid when lords and ladies chose to take up arms to increase holdings or bloat purses. He’s a real Stark; he bears no trace of the Valyrian madness that brought down Daenerys (Emilia Clarke) and the rest of House Targaryen. He is confined to a wheelchair, so he never took up arms and fought on the battlefield. He spent two seasons as far removed from the bickering politics of Westeros as possible, and to be blunt, rolled through the biggest heap of aurochs dung possible and came out with none of it on him. Everyone else at the table, from stupid Uncle Edmure (Tobias Menzies) to jumped-up pirate Ser Davos (Liam Cunningham), has blood on their hands.
The best way to save innocent and not so innocent lives is to break the wheel. Ending the cycle of bloodshed in the pursuit of power would not be possible in the hands of one who sheds blood in the pursuit of power. One look at Bran, the ‘broken’ boy in a wheelchair, makes it abundantly clear that he won Game of Thrones by not playing it.
“Bran has no interest in leadership” – Sansa Stark
Not surprisingly, Sansa is Bran’s best motivation for assuming the office of king. He doesn’t seem to really want the job. After Bran shed his humanity and assumed the cloak of the three-eyed raven, he is a changed human. He has literally outgrown his mortal shell and has a new perspective.
That’s both good and bad. The bad reasons mostly involve a lack of empathy. As Meera Reed reminds him, Hodor, Summer, and Jojen all died protecting him, along with most of the Children of the Forest. Reuniting with his family should be cause for celebration, but Bran seems largely unmoved by the reunion, if only for knowing they were all still alive from poking around in the timestream. However, it is more than that.
Bran’s separation from the living world will make him king. He is aware of the consequences of his decisions based on personal losses. However, he is far enough removed from most humans not to be tempted to revisit old conflicts to settle scores. If one of his allies inevitably starts a plot against him, such as Sansa, he is in a good position to stop it before it starts without holding his hand back to spare a loved one.