Following a trail blazed by many millennials before her, Arya retreats from her life of Westerosian disruption to reclaim her room at her parents' house. But before she can do that, Nymeria offers her a rude awakening: one does not simply return to an abandoned life. Despite Arya begging her to return, and a round of intense eye contact, Nymeria turns the other cheek. The move breaks Arya's heart… then pieces it back together. This makes sense. "That's not you," Arya says to herself, recalling her own words to Ned Stark all those years ago, when he insisted that her life could be all pretty dresses and a seat next to a handsome Lord. Not Arya, not Nymeria. They walk on their own path -- but that doesn't mean the path can't lead back to the ones she loves.
The road to the end of Game of Thrones seems clear for the major players: Jon is on his way to Dragonstone to unite with Daenerys; Sansa is in charge of The North, and will probably have to dispense with Littlefinger before doing any real damange; Cersei is amassing troops and has Euron doing some dirty work in the high seas; but what of Arya?
On track towards Winterfell, her eventual role as a natural born killer with a PURPOSE could be an x-factor in the Great War to Come. Especially since we know Nymeria is around to lend a paw. While both woman and beast are living their individual lives, we suddenly have a rogue player back in the mix, ready to Canine Ex Machina up in this joint. Imagine a horde of White Walkers. Then imagine Arya on dogback, riding into ferocious battle to serve justice for reasons beyond a personal vendetta. Imagine a new kind of hero, Arya's great purpose, and a satisfying end to a character we could really love once again.