Obviously you would not use that absurd shutdown procedure. You'd give a warning and tell the driver that the engine is going to shut off in X minutes, and afte

Obviously you would not use that absurd shutdown procedure. You'd give a warning and tell the driver that the engine is going to shut off in X minutes, and after X minutes you decrease its max speed to 10 km/h for Y minutes before shutting down completely. Cars already do way more dangerous stuff if you assume that arbitrary components fail. It also depends on the reliability. You could also say that you can't just shut the engine off if the electrical contact in the keyhole is wonky.