So lets recap:
A Lannister killed a Targaryen to because the Targaryen went mad and threatend to unleash wildfire.
The Starks end up being the hand of the Lannisters in the North.
The Starks are killed by the Lannisters, a Lannister ends up being the Hand of a Targaryen.
Meanwhile the Lannisters end up using wildfire in a similar fashion that the Targaryens were about to do before slain by the Lannisters.
And turns one of the surviving Starks is actually a Targaryen and a Targaryen sails towards Westoros to dethrone the Mad Queen Lannister, who is lovers with the Lannister that saved the world from the Mad King Targaryen.
I love my high quality soap operas.
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Being that the North has pretty much accept the threat of the White Walkers behind Jon, I think they'll figure that Brann already has a job. Also by rallying behind Jon they pretty much threw the namesakes out the window.