As season five of Downton Abbey came to a romantic end on Sunday (Carson proposed! Does Mary have a new love interest?) Maggie Smith has fueled speculation that the show’s next season could be its last. “They say this is the last one, and I can’t see how it could go on,” Smith told The Sunday Times with just a hint of her character the Dowager Countess’s sarcastic sense of humor: “I mean, I certainly can’t keep going.