In theory, the software currently used (and being improved) for satellite constellations and drone "swarm" performances could be adapted to flying car traffic control.
But, given how people tend to use cars, particularly their illegal uses of cars, makes me think that such software would not be able to safely handle the effects of people flying hacked flying cars outside the control network.
But, people will hack some of them if they can get their hands on them - and then use them to joy ride, rob banks, etc., once they become available. Heck, I recently read a story about a guy who stole a car and did several hit-and-runs before disabling the car and escaping on foot, only to stick around and steal an ambulance responding to one of his hit-and-run victims, then going on another spree of additional hit-and-runs with the ambulance. Not looking forward to that in 3D.