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.