OK sure, but do they now also need a warrant to look at their own footage from their body cam, or their dashcam? What about the camera on the side of the municipal building?

Compelling parties to give up data is different than looking at your own data. And it is firmly established that recording and reviewing footage in public space is totally fine.

So we are back to square one...How do we define scale such that a police camera on a police car is OK, but a police camera on every corner is not. Or that individuals can record in public but police cannot.

Sometimes the law is vibes, SCOTUS will probably create a set of tests where lower courts will have to look at how many points it hits and decide whether it's over the line on a case by case basis.

I don't know what the philosophical answer is, but the real answer is that we don't, the supreme Court does.