[qanael]

I've always felt like flying cars are a solution looking for a problem. Massive deployment of flying cars has similar problems to cars on the ground (need space to land/park, airspace isn't unlimited, humans can't be trusted to fly safely). Additionally, they don't go fast enough to glide and don't have enough rotor mass to perform an autorotation in the event of total power loss. I doubt they're viable as a method of transportation at any large scale.

EDIT: Not to mention the much worse energy efficiency - staying in the air is _expensive_.