With all the buildup involving the Iron Bank, that is entirely possible IMO.
And there's also what GRRM referred to as the Chekov's gun of Nymeria and her ever-growing packs of rampaging wolves in the Riverlands. Arya is developing her skinchanging skills in Braavos, and she
I think that Arya will have a very important role to play in the endgame. It just won't be parkouring out of a tree to slay some "Night King". It'll be better.