[yawaworht12]

The longer self driving cars take to completely replace cars, the harder it is for a self-driving only company to compete. You can't run a network with only self driving cars unless you they are all level 5 under all driving conditions (like poor weather) and you literally have hundreds of them in each market you want to compete in so you can guarantee availability.

Customers want reliable transportation. Imagine if your internet company could only provide service when the weather was good. You'd quickly switch to the service that is reliable because being without service becomes unimaginable. This is especially important if you want to compete with car ownership and not just livery services. These companies also need to be reliable on pickup times. If a service take 5 minutes sometimes and 25 minutes at other times, most people will give up on them and go for the 5 minutes all the time service.