Dumb idea. If you think traffic on the streets and roads is bad, think what it would be like in the air when there is nothing to restrict the flow of traffic and cars are flying to and fro at the will of a driver who thinks he's more important than anyone else. It would be like opening the amusement park ride 'bumper cars' in the air, except the cars being driven wouldn't be padded for your protection.
If you thought personal drones were a hazard to air traffic, try putting a bunch of ego-crazed, self-absorbed idiots in the air to mess with air traffic. On top of that, can you imagine the people that run out of gas, have engine problems, or an accident in the air and then come crashing down into a building, such as your house, or a crowded street? No thank you, flying cars are not high on my list of desired innovations.