Most of us tech people are good at imagining ways technology might be abused, but we’re not as good at thinking like actual criminals.
It’s a simile story with smart home gear: Tech people go to great lengths to imagine how their smart locks might be compromised by hackers who will break into their homes, but real burglars will just break a window and go around it. Tech people imagine how their wireless security cameras might be vulnerable to WiFi jamming, but criminals will just wear a face covering and park around the corner.
I’m sure high value targets have specialized vehicles where these systems are removed, replaced, or disconnected. For the rest of us, the biggest concern would be if a hack enabled vehicle theft, as that would be more likely to be abused than a movie-style assassination where someone locks up our brakes from a drone or something equally complicated.