>Congestion is not solved by small expensive air taxies
If you expect a new transport to 'solve congestion' as a requirement for it to be allowed, we're not going to allow anything. Incremental improvements can add up.
I just find these "I can't have it, so you can't either" arguments so short sighted. Lots of technologies start out the domain of the wealthy before achieving scale and mass adoption. Maybe we won't all be mass adopting air taxis, but some of the technologies that come out of these things may well end up in our cars, or houses, or benefiting us indirectly.