I think we'll eventually just see a screen in the vehicles and there won't even be any steering wheel or driver controls. This is how the CyberCab is designed.

The cars will operate seamlessly with the app(s). Waymo's driving ability and ease of use was pretty impressive but with all those expensive Lidar scanners on the cars I just don't know how they'll scale and be profitable. I think this is where Tesla has the advantage. Every car they sell is capable of autonomous driving using just regular cameras.

Amazon is throwing their hat into the autonomous taxi ring with Zoox. It's got that box design that you describe.

What I'm really excited about is the RoboVan. It's an art deco design with a modern spin.