Flying cars would be a disaster. Taxes would go up, because we would have to train flying cops, and provide flying cop cars. Can you imagine people dropping cigarettes from the car, and it lands in your cup while you're sitting in the backyard?
What if someone drops a cig on a baby? And you know terrorism would be too easy.
And what about the a$$hole too lazy to get gas after work, so he thinks he has enough just to make it to the gas station, but he doesn't, and the car runs out of gas, and falls to the ground.
(That happened to me once when I was 21. My shyt stopped at the end of the block)