I don't think Jon and Blondie will rule the seven Kingdoms - just too easy and predictable.
This Bran thing has been a sub-plot for a long time, he was touched in the "burrow" of the last 3-Eyed Raven when he dwelled to long in his visions, so I assume this will be a key vehicle in the plot. The current tactic as described to use Bran is key to luring out and isolating the Night King and destroying him as thier only hope of dealing with the overwhelming odds of defeating the vast Army of the Dead. But I guess all that's fairly obvious. Anyway I'm betting my chips that Bran will indeed be key to this and even reveal powers that enable a victory or at least temporary survival over the white devils.
...and yes it is a bit disturbing to see the once innocent child Arya now grown and being sexualized, but I did drive home the point of eat drink and be merry for tomorrow we may die!
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