Plenty of obstacles for the dreamers of EP pax carrying commercial Ops. A/C have lots of elect gizmos to support their operation, lights, avionics, retractable U/C (if the pie in the sky stuff ever got that far!), flaps, AC & or fans, ice protection all cutting into that precious batt supply! Even sitting in a cue awaiting to T/off is eating into yr reserve of FF!
I hope I am around to see these in service, maybe in my next life -)