No need for towing. There is e-Taxi for Airbus and WheelTug for Boeing: electric motors in the nose wheel which can taxi the aircraft using the APU Gen, or assist one engine.
Also no need for a pushback tug or towbar, (unless the ramp is icy), just someone on the headset. Save time at busy airports where many have to share the same push crew.
I tried to interest my previous airline in this, but then they went into administration.............
