A more accurate, 3D mapped street view could probably allow GPS-less geolocation and could also help autonomous vehicles as they would get more information than what they can immediately see.

I could see well-mapped street view with good services built around it, and maybe a way to pay for and schedule regular updates, being used for towns to monitor public space long term too.

I think many things could be built on a better street view, but I also don't want Google to get yet another de facto monopoly in a new domain.

This already exists. If my phone fails to get a good GPS signal Google Maps prompts me to turn the camera on and spin around in a circle. I would also be unsurprised to learn Waymo uses Street View

>could also help autonomous vehicles as they would get more information than what they can immediately see.

Waymo and others already do this, that's why they can only operate in mapped areas.

Given that Waymo is a google company, they almost certainly started with street view data.