I'm no fan of Uber and I can't stand its founder or his ridiculous smirk but... they played this well. Uber's got game when it comes to politics. If either political party ever learned demagoguery from Travis, I'd be scared.
It helps them that their opponent isn't sympathetic at all. Non-zero medallion values, by definition, mean that there are too few cabs on the road (and in New York, there are). The Medallion Mafia pisses me off; just a bunch of rent-seekers stealing money from drivers.
I'm actually glad to see the Medallion assholes get "disrupted". I just wish that it were a different company taking the lead in doing it.