Drones (quadcopters, etc..) are already causing problems in the public air space, I can't imagine the politics, the rules, and regulations around flying cars even if we have these flying cars already.
Technology for flying cars isn't the big challenge, it's the rules and regulation that will be the roadblock. I don't think the George Jetsons will become a reality in my life time!
The topic is about flying cars availability in near future. With so many years passed with speculations about launch of a viable flying car model, actual vehicle that can fly besides being roadable is far from reality. Although mobile giants have worked on this, there are entrepreneur issues along with administrative issues preventing flying cars from becoming a reality.