Seeing as how most car manufacturers don't even have the sense to do things like ... NOT have an always-connected onboard entertainment system that isn't firewalled from the car operation controls like steering and throttle ... yeah, I don't see this getting anywhere fast.
It should be simply on a completely different network.
The same should be for the navigation systems that do interface with the smartphones to redirect on a large screen.
And all the information exchanges should be with strong encription.
But what is most important is that there should be a way to manually override the electronics if needed; like in trains.