Safety Critical Components (ECM, ABS, etc) need to be certified. This is very expensive and modifications are done very infrequently. I doubt that auto-manufacturers will use Embedded Linux for them.
Yes, but what's about the components controlling speed, e.g. by detecting the speed limit from some map? Or the stuff implementing emergency calls?
Also there is a plethora of features I (charging station maps) which probably need all maintenance, too.
