I would love to see manned multirotors in operation, but I agree they will never work as taxis because of noise. People buy houses near airports and then complain about the airport noise, and they have relatively low traffic volume along fairly narrow routes. As far as pilots go, it's not possible to pilot a multi-rotor in the normal sense because computers are required to manage the motors, so a human really cannot do anything more than what you do with remote drones (giving it relatively high-level commands). But there still must be a PIC and of course the pilot must know radio, navigation, weather, etc.