Sometimes it's about people fighting (and occasionally losing to) a mannequin.
Who says there has to be a cap? There might be a lot of different shows, but there are a lot of different fans, and some folks are in it for entirely different reasons. Heck, the same argument could have been (and has been!) made about sci-fi space operas, and while I'm agnostic in my likes -- Farscape and Battlestar Galactica are equally on my watchlist -- there's pretty much always room for more.