With those that mentioned the flying cars, yes we have them now but regulated so much etc etc expensive etc etc, they will go down in price, yet atm because of regulations, it'll actually be hard to fly one and will have to tell the nearest air traffic control where you are and fight with the big 747's that are never allowed to be within 2 miles of each other with the exception of approaching airports.
Problem is, even from the 1950's and even 1985 (Back to the Future) all thought we'd have flying cars as the norm in 2015. I know why this is. It stems from the fact that the technology in both times were advancing very fast, but since the 1990's car technology has somewhat slowed down. Its still advancing, but not as fast as people hoped, also we are not looking towards flying cars but we are looking towards alternative energies example hybrid/electric cars.
Heres a fun fact: Despite the inefficiency of the petrol engine, when it was first bulit and some few years after it, ELECTRIC cars were the most common cars on the road. Its the range, petrol has an advantage to being able to cover 4 times the range BUT it leads me to my next question..... Its 2018 now, we had electric cars in 1918!!! Why havent battery/electric technology advanced so far? Well its like the flying car scenario, never needed to since they didnt worry about pollution and oil reserves, so in turn we never needed to improve the electric batteries scenario.