Sky cars won't happen in this lifetime due to a few factors, not least of which is inefficiency in overcoming gravity at a speed sufficient to maintain flight i

Sky cars won't happen in this lifetime due to a few factors, not least of which is inefficiency in overcoming gravity at a speed sufficient to maintain flight in air as dense as ours in here on Earth. The other factors are obviously we'd need a whole lot more airports or some kind of safe VTOL aircraft, and when it comes to safe, just look at how people currently operate motor vehicles in the US...not gonna happen. Tons of regulatory hurdles too, not to mention things like parking. The solution to this problem as has been shown by most other civilized countries on this planet is trains, yet in the land of rugged individualism and capitalism, it's somehow not viable.