Or tubes, we could all travel in tubes! (I feel some Tenacious D coming on
The public would still have to fund tubes. No Dice.
I am half serious with this. I heard yesterday that the state of Massachusetts will have a 17 billion dollar transportation deficit in 20 years. That is only one state, but it is pretty congested and has a lot of tax payers. I would imagine larger states with more roadways would be in worse shape.
With flying cars, it is a personal investment. Little infrastructure is needed aside from traffic regulation. If all the money going into building new bridges, tunnels and roadways to ease congestion was diverted to research, we could reasonably assume that we could have a commercial product within 20 years. And if fuel taxes continue going to maintain smaller road networks, land based vehicles and trucking could still operate.