Traffic stops could then be relegated to imminent dangers like drunk or otherwise reckless drivers, and serious crimes.
If the ticket is for the vehicle owner then yes I could see this working. Perfect for emissions violations and vehicle code violations. You could also double-check for stolen license plates as it should be fairly easy to automate the detection of most car makes/models as long as the car hasn't been heavily modified.
That seems like an asinine way to apply that law. If the vehicle is registered to you, it's your responsibility. Lent it to your uncle and he rolled a stop? Well, the car's registered to an owner, that's their problem to sort out.
I think it would only take one instance of a friend borrowing my car, getting a fine, and that friend refusing to pay the fine, for me to stop lending them my car -- lesson learned. Or hell, why would I even want to be friends with someone who would do that to me?
In Australia its still your problem. If someone else was borrowing the car you have to get them to admit they were using it at the time. The only way I think you will get off is if you report the car as stolen at the time.