This article makes one awesome point for regulation that would be beneficial: exchange of data on passengers and drivers. Even if opt-in (for privacy reasons) this would be awesome. As a customer, I would love for my reputation on Lyft to be usable on SideCar and vice versa. On top of that, I'd love to be able to call a car from both companies simultaneously and whichever company gets met a driver first wins my money.

Requesting a car needs to look more like the financial system where your broker puts out a buy order and a broker representing the driver takes that buy order.