My bet is that personal flying vehicles will happen and gradually spread
probably not as a mass replacement for ground-based vehicles
but it'll be fully-autonomous vehicles. It won't be Average Joe becoming a pilot.
EDIT: Well, okay, I mean, you can get personal flying vehicles today
in the US, you don't need a license or anything to fly something like this:
https://en.wikipedia.org/wiki/Powered_parachute
...whereas you do to operate a car on public roads. Just not allowed to fly over built-up areas. But I'm talking about heavier vehicles.