I'm amused at its modification to "showran", as well as its application to game shows, but "showrunner" is a perfectly valid word at this point, even if you hate Variety-speak. It's certainly been the only job title I've ever seen associated with certain employees for various TV dramas. It's not like "yeah, he's our showrunner, look at these skeds", it's "the creator, showrunner, and producers had a quick meeting".