Two reasons they aren't as common as you think. First is the infrastructure. At this time, the number if fly in communities is limited and general airports aren't always convenient for commuters. Second is the economy. The cost of the current models is high. You'll see the highways full of Rolls-Royce, Lamborghini, Ferrari, and such before you'll see the car planes.
On the flip side, there are the ultralights, but those are more for the hobbyist than actual commuters. Even an ultralight helicopter has its problems preventing it from being practical, parking being the big bugaboo. Then, in areas like mine, in the snowbelt, they are as practical as riding a motorcycle in a blizzard. High winds and exposure to the elements make them impractical for everyday use.
But it's not being ignored.