Has er been cancelled after season 15?
It wasn’t exactly cancelled, it just came to an end. Series finales tend to take a few well-worn routes, ending with a gotcha moment (Newhart, St. Elsewhere, Roseanne) or the old gang saying goodbye one last time, because everything’s changing (Mary Tyler Moore Show, MASH, Cheers). ER chose to follow the ‘life goes on’ model, which may be true to life but isn’t very memorable: a few touching interactions, a few jokes, and, in the waning moments, another major trauma rolled in and Dr. Carter and Dr. (Rachel) Greene taking their spots alongside the rest of the staff to do their jobs and try to save some lives. It was the only real way, if not a very dramatic one, to end such a sprawling show.