Uber's proposal is for electric tilt rotor in an urban environment
No wonder they are regulator shopping, who will want to sign off that kind of operation? One only has to look at the history of tiltrotor alone to realise as a public transport concept it is very risky, let along throwing it into busy cities with 1000's of people to kill on the ground.
I love to know what the contingency is for an engine failure in transition, or for a stuck rotor in transition.
CASA would be crazy to even entertain this proposal as it stands right now.