Find the plans for the Dean Drive

Then we can talk about flying cars.

But considering that your average groundcar driver knows bugger all about piloting even when he can't leave the ground (barring Dukes of Hazard-style jumps, which I can tell you from personal experience play Hobb with the car's suspension and tires), I have to agree with the other commentators here - flying cars for everyone are simply a very, very bad idea.

On the other hand, I'm betting that private space ventures will be making ground-to-orbit-and-return flights within a decade. It's the only way the billionaires can be sure to get a slice of the wealth available in the Solar system that's above the Earth's atmosphere.