The technology is there to have flying cars, too.
The reason we don't all have flying cars is the cost of flying cars isn't worth the benefit of flying cars.
If I could have an Electric car tomorrow for $15K that would have the same performance and cost as much to operate as $15K gasoline powered car, I would go out an buy it. Right now.
1.) It doesn't exist.
2.) There is no indication it will exist in the next 10-15 years.
Just cause it doesn't exist now, and may not for another 10 years doesn't mean that it won't ever exist. Nor should folks just throw their hands up in the air and say "never mind, we can't get it done next year, so we shouldn't even try".