Ghengis,
You are brave to extrapolate today's designs 50 years into the future. Can't you imagine how much people will pay for a 4 g takeoff followed by 20-40 minutes of 0 g ballistic (meal/drink service in sip tubes) and a 3 g approach for that smooooooth touch down, just to do Tokyo to London in an hour. It would definitely be "cooler" than the concorde!