I've got a better idea in the same space. I've always wanted somebody to take the idea of "leave when full" minibuses in the 3rd world and apply it to popular airline routes. How cool would it be if there was an operator running flights from Los Angeles to San Fransisco using small commuter jets with no fixed schedule and plenty of planes. You'd just turn up, buy a ticket, make your way to the gate, and get on the pl…
This only really works on very high volume routes, and the problem is your aircraft basically need to be dedicated to that route; a lot of the short flights otherwise (SFO-LAX for instance) are continuations of longer flights, which allow a carrier to for instance do a BKK-NRT-SFO-LAX flight and offer nonstop BKK-NRT (if they have 5th freedom), NRT-SFO, SFO-LAX, and direct BKK-LAX, BKK-SFO, BKK-LAX, NRT-LAX, using one aircraft (and probably 2 crews).
I think security screening is what killed the "air bus" market.