Also, at this point of time, maybe we can engineer good specs and good price into the product, but we cannot overcome human factors.
- Riding in strong winds. - Loss of control over populous areas. - Higher risk of crime in a vehicle that has no boundaries like roads and dividers.
The most likely solution is to make a cloud connected one which refuses to fly in or into bad weather, automatically lands during emergencies etc. But then that will necessitate some sort of remote control over the vehicle, leading to a host of other issues related to lack of privacy.
http://www.volocopter.com/index.php/en/
(Disclaimer: I have crowd-funded invested a modicum in it)
That appears to be underway in Germany (though bureaucracy moves slowly...). USA/FAA, of course, remains to be seen, though the general move to performance-based certification makes me a bit more optimistic.
At any rate, the two major roadblocks are regulation and battery, as ever.