The law puts a floor on non-taxi prices at Uber's current black car price. So 0% of their current black-car fares would be affected. What this does is prevent

The law puts a floor on non-taxi prices at Uber's current black car price. So 0% of their current black-car fares would be affected. What this does is prevent any future competition on price (like UberX in San Francisco). The law will literally prevent anyone (other than a taxi) from charging less than $15 for a ride, and for no obvious benefit to anyone other than Taxis. For me, the difference here is clear. When I order an Uber, I have a certain expectation of quality, and I have the option of never using their service if they totally blow it sometime (or I can give a driver a bad rating, and if he/she gets enough he gets booted from the service). If I get a lousy ride from a Taxi, I don't have many alternatives. If a law is passed that prevents anyone else from competing on price, I have even less options.