I don't see how ride sharing services are ever going to be more efficient than public transit. Or how it will even be barely possible to replace the one with the other in a place like NYC.
Riding sharing is about utilizing a vehicle in a temporally more efficient way, but it does little to improve spacial efficiency during peak times.
The commuter rails, subway, and buses are far more dense than a fleet of self driving cars with one to two people in each can possible be. Even with the increased density that might plausible come from better driving and so more tightly spacing, it would simply be impossible to get everyone into and out of their offices across Manhattan during the communing windows without the density of mass transit vehicles and the utilization of underground space.
Riding sharing is about utilizing a vehicle in a temporally more efficient way, but it does little to improve spacial efficiency during peak times.
The commuter rails, subway, and buses are far more dense than a fleet of self driving cars with one to two people in each can possible be. Even with the increased density that might plausible come from better driving and so more tightly spacing, it would simply be impossible to get everyone into and out of their offices across Manhattan during the communing windows without the density of mass transit vehicles and the utilization of underground space.