[Kaibeezy]

In one way of looking at it, a horse and a car are the same thing: low energy and low complexity for high flexibility and maximum speed ground transport.

As energy and flight tech become cheap enough, with no exhaust blast, small footprint, highly maneuverable, etc., they will supplant wheeled vehicles for shorter and shorter trips.

Alternate transport tech also plays a role, such as Trantor-style moving sidewalks in densely populated places, etc.