And this is where the autonomous flying is coming into place: you will not fly this car at all. Software will be certified for this.

Which means:

1. wait for tesla like autonomous software that works for cars - we have for planes but this is a bit different 2. either high density batteries for electrical engines or very light weight ICE engines ( biodiesel or bio ethanol ) to be mass produced

It's not just the flight training that's the problem. It's the expense of maintaining and certifing the vehicle, and those regulations will never be loosened.