I think very few people actually watch an entire season in one sitting - but I think most people want access to an entire season at once. I think this is a good thing; I read a book at my own pace, and I want to watch a season of a show at my own pace. (Which usually is about five episodes of the show a week.)

There was an NY Times piece (which I cannot find) back when House of Cards first came out talking about why actors and directors who typically do movies are now doing television. Giving viewers an entire season at once gives them enough space to tell long, subtle stories, and the up-front investment from companies like Netflix lets them have production values typically reserved for feature films.