Does that hold for individual pick-up's and drop-off's, though? I take UberX to and from Reagan in D.C. every time. Can't imagine it's a huge leap to gather groups together the same way.

I have to believe the airport shuttle business which is huge, is going to go away at some point. Last time I took one I chose to pay with a credit card at the time of departure and the driver took my credit card and read it over a phone to a dispatch agent in front of an entire group of people who were forced to wait while it was authorized (this process was repeated for about two or three other people). I'm not even sure this is legal, but it certainly isn't optimal.