neat idea...until the motor catches on fire
neat idea, except at our airline the first flight of the day has to have 5minutes of engine running at idle/taxi prior to takeoff (warm up)
great idea except for the weight
great idea except when the APU is on MEL
great idea except I'd rather have internal stairs as weight instead of electric motors
great idea except for ice on the runway/taxiway and the need for reverse thrust to stop