"Flying Car" seems so cool, but really think about it. Would you drive your car-airplane around on the ground all the time? An airplane already costs lots of money to maintain when it is only flying and sitting at the airport. Now you also have to pay even more for it for the wear of driving on the streets. I mean, this is really only an option to drive from your home to the airport from time to time (not for every flight). And in those cases, you might be able to find some kind of stowable airplane where you can remove the wings from, store them on a trailer and just get that thing home safe.

Honestly, I hope we one day have a solution for some Quadcopter-style of private transportation (best: electric). That would make completely new styles of cities possible as streets would be only used to walk around. Endless nature, no streets in it... just houses with Quadcopters on their roofs, ready to fly away... (still hope they have some kind of crash avoidance system, so flying to the next big time baseball match doesn't result in many deaths each time).