Everyone knows that the automobile will eventually become obsolete for primary transportation, the only question is when. It is my contention that the aircraft is the obvious replacement for the automobile.
The major issue is affordability. My VTOL aircraft described earlier in this thread is an example of the aircraft that will eventually replace the auto. The auto was unaffordable until it was mass produced. I contend that if my aircraft or a similar design can be mass produced to make it affordable, it will become the new form of primary transportation.