well we may not have 5th element style cars on the horizon... but blade runner-esque seems more probable...in the meantime... we already have the Harrier jet ...why not a harrier car? Tech wise we already have the know-how and we build such vehicles already. It is feasible...but it really is about practicality ($$$ wise) A freakin' used float plane is $150 000 (at the bottom end of the price chart) A (2 man bubble-copter) helicopter isn't any cheaper...it's just more expensive. with current tech...even immediately foreseeable tech...to hover ...the harrier consumes vast quantities of water as coolant...which is a waste of cargo/ weight allowance...and consequently can hover a very short period of time and then must take-on more water to be able to hover again. A harrier ain't cheap. The tech don't come cheap...it's a LOT more than a few hundred thousand dollars for one. Around roughly ...$25 000 000 yup that is 25 million... Then there is the cost of full automation bumping the price up. So... saying you could make commercial harrier-style vehicles for the public with the necessary automation for it ...it would probably be the same price sans the cost for the armour, weapons, and insane unnecessary combat engine, and increasing the seating from 2.... to for 4 to 6 Magnets are great...the super-duper magnets used on the bullet trains are almost on an enclosed track...so the train doesn't fly off.... Using the Earth as a balance point similar to the track for the bullet trains is flirting close conceptually to anti-gravity I think.... The cost....bottom line is ... It's gotta be cheaper building material/ energy consumption/ final price tag/ repairs than what we use now for it to " take off" so-to-speak