Are you kidding? He is the one person who came out of this conflict richer than everyone. He is the most practical and efficient person about finances who invested in both sides and made a profit where even the Golden Company lost. Except that all comes from the books, y'know. The direwolves stopped being relevant after the first one. They were a symbol of a house and their fates sort if reflects that person's attachment to those houses. And there were plenty other plots that end just as abruptly and go nowhere in the book - like that one reasonable Lannister guy who tries to be a good regent for Tommen and make peace with the factions Geoffrey upset, and then Varys just murders him and that never amounts to anything.