Economies of scale typically also come with bureaucracy, complacency and lack of competition. Larger can lead to efficiency, but it can also lead to these other things, which are typically bad for the consumer. There is an optimum size to everything and from my perspective the status quo ain't it. Not being in the industry I wouldn't have the foggiest about what size you need to be in order to buy into the "big enough to play" club, but I think we currently have a few that are in the "too big for their britches" club.