Obviously congestion will be a factor, but consumer demand will drive adoption and we will have to figure out congestion.
It's also highly likely that Air Taxi's will rip the guts out of the commercial airline industry profits because it will take away their best customers, the last minute business traveler.
Speculating here: is if Eclipse Aviations jet is what it claims to be (and that's a big if) is that we will be left with air taxi's for expensive point to point trips and last minute business travel, and discount airlines like Southwest running discount high-volume routes for Vacation travel, family, etc.
Wonder what's being done to protect people on the ground from these new toys...