Joking aside, that's an interesting point actually, since it would probably be a common argument for this this type of transportation.

However I doubt it would work for the masses due to Jevon's Paradox https://en.m.wikipedia.org/wiki/Jevons_paradox

also the fact that an airport is usually not where you live or work, and in the U.S. that means you're still adding to traffic pre/post flight with an additional need for a car on both ends of the trip.