TopBunk
That supports my point. If cost of fuel per seat was the dominant factor in decisions of how to operate the aircraft to the point of saving 50p a seat then most short-haul journeys would be in turboprops, of whatever size. In that case of course there would be 100+ seat turboprops, as there would be a market for them and there is no technical reason why not. However my case does not rely on the possibility of 100+ seat turboprops, only on the fact that for most short-haul journeys the cost per seat, however many seats there are, is lower.
Let airlines operate aircraft, let ATC give them the service they are paid to give, and give so very well in the UK and much of Europe in my non-trivial experience. Oh, and let me descend outside controlled airspace if I want to. If I ask, there is a good reason.