Instead of flying cars, we should talk about road going planes. This video focuses to much on the wrong application, flying cars or let’s say, “road going planes” are not useful to avoid traffic congestion but door to door travels with planes. Using a private plane can safe a lot of time compared to driving a car, but is takes a lot of time travelling to the airport and going from the airport to the final destination. If it would be possible, to travel from at home or the office with such a device to the next regional airport and from there to another regional airport close to the destination and continue to the destination with the same device. This would be a mayor benefit over waiting for taxis, carrying the luggage and so on. If such a road going plane would exist, it would surely have a big marked, despite the price would be in the supercar range.
The technical difficulties are another topic, it would be extremely difficult to fulfill all crash safety norms and emissions and being able to fly properly at the same time. I would start with and hybrid propulsion, where the combustion engine only works in flight mode. The electric system could give some boost power for take-off and provide enough range on the road for let’s say, 200 km at low speed (e.g. 100 km/h). By doing so, the drivetrain will become very simple and the car is an purely electric vehicle without emission control (the batteries will only be recharged in flight). I don’t know if it could be done, but I’m sure it would have a marked among those who can afford a Cirrus SR22 or a Diamond DA62 in combination with a Porsche. Its not a stupid idea per se, but a very demanding development aim.