Thinking through this more. I've noticed that a lot of drivers work both Uber and Lyft (flexibility allows this). Would that go away in the employee model?
Because the pool of drivers for a particular company would be massively reduced as well, driver down-time between rides on their platform may be expected to significantly decrease, which was a major reason for running multiple apps in the first place. Basically the remaining drivers will essentially partition themselves into two pools, driving exclusively for either Uber or Lyft. I'm not saying anything about whether that's good or bad, but it seems a likely outcome.