The bottleneck seems to be energy. Electronics don't really require that much power compared to transportation and living space, and have been able to make "futuristic" advancements even with our reliance on primitive power sources (i.e. fossil fuels).
Not that this has necessarily been a bad thing; perhaps better for human evolution to have the free worldwide communication system that boosts our intelligence before we get boundless energy potential.
As far as medical advancements go, well, it's hard to hack yourself. I'll expect the flying cars well before the intelligence pills.
It is possible today to create airplanes that use less energy per mile than a good car, traveling at higher speeds. I think PG's comment about government involvement is very relevant here - the reason such airplanes aren't the norm is bureaucracy, politics and law. Intellectual inertia.
The problem regarding personal air travel is almost purely political. The only real technical hurdle I can see is the problem of getting them into and out of the air: we haven't yet created airplanes that both are energy-efficient in the air and land or take off vertically. Tilt-rotor designs are the most promising candidate I can see for this (you need wings to travel cheaply), but they would have to be under computer control unless we want reckless pilots to die in droves while landing. The efficient planes I am talking about here don't need a mile of runway - 500 meters is plenty.
In case my first sentence draws criticism off the bat, please consider that there are four-seater, canard airplane designs that cruise at 170 mph at 5 gallons/hour = 34 MPG. And this is with today's airplane engine technology, which hasn't changed since the 1960s. The problems which then remain are infrastructure, training and inertia, which are purely political. I have confidence that we will eventually have personal flying vehicles ("flying cars"), but this shows that the problems faced are anything but technological in nature. People ridiculing the old notion of a near-term "flying car" are bashing the wrong people. Why do the scientists always get the blame when it's just cultural inertia that is the problem?
Not that this has necessarily been a bad thing; perhaps better for human evolution to have the free worldwide communication system that boosts our intelligence before we get boundless energy potential.
As far as medical advancements go, well, it's hard to hack yourself. I'll expect the flying cars well before the intelligence pills.