They reckoned with Concorde it took more time to get on and off the plane than it took to cross the Atlantic. With this sort of system it's going to take more time to get on and off the plane than to fly round the world.
Spot the bottleneck here?
Being told to get to the airport ages before the flight is due to depart, queueing up for ages to hand over hold baggage, queueing up again for airport security which is completely inconsistent (on one flight to Crete I went through 3 sets of airport security and got different results from each)
Sod faster aeroplanes, I'd rather not spend most of my trip stuck in the "hurry up and wait" system for boarding and leaving and I'd definitely prefer more comfortable seats, a bit of leg room, larger windows and not having the flight crew keep waking me up to see if I've changed my mind about buying a blow up model of the plane.