Second, hacking should be a non-issue. Any mission critical electronics should be completely firewalled from anything with a path to the outside world (i.e. cell/wifi/bluetooth radios in the infotainment system). Those two systems should have one way communication from the mission critical to infotainment so the driver can be alerted to status. There should be no communication path from the infotainment to mission critical. This is all trivial to do in hardware.