I believe human can free flight in this century. people can easy to dive aircraft as a car(with wheels).
If a aircraft will become a practical flying car. I think it must be have these basic feature:
1. VTOL(vertical take off and landing)
Even most rich place or country in the world, you can't build airport for every family. If a practical family aircraft always take off or landing with airport, it's really not easy to use. it can't became the public transportation.
2. All moving part must be inside shells.
Many modern city always crowd. The flyingcar must safely fly through between high-rise. And can get some small collision without crash, not such as helicopter.
3. Technology was extreme low-end and structure was extreme simple.
Most often something was more simple means it will more cheap and safely. I hope the flyingcar is cheap, very family can buy it.
4. Fly don't be dependent on aerodynamics, but dependent on a stupid truth: thrust > gravity.
That's really important. If a aircraft can fly without aerodynamics, means it will easy to made. Everyone can build it.
5. Long distance of flight
World's first manned flight with an electric multicopter was succeeded in Germany. The multicopter will become practical flyingcar. But now the battery really don't enough for Long distance's flight. So the flyingcar must can use other engine(eg: jet, piston).
I wasn't a rich guy or celebrity. So i don't have enough money to make real flying car, i just share my idea: SPOFC
If you interesting in this idea, please try make a cute model or tell other one. Let us try build real flying car by everybody.