Quite frankly, it would be much better if the various pieces of firmware and IVI software were open source and available. Then third parties, like auto mechanics, could have access to this information and be able to do repairs. As it currently is, all SW repairs have to be done through the dealer. They are bad enough with proprietary diagnostic tools (why the "check engine" light is on).
IANAL, but I believe there have been cases in the past where car manufacturers tried similar tricks on hardware to prevent third party repairs and were smacked down by the courts. I don't see why SW would be so fundamentally different, there just haven't been enough court cases yet.
When you buy something, be it a car or a computer, it should be yours to tinker with as you please. Manufacturer lock downs should be as unwelcome in cars as they are in computers or tablets. Of course, if you do change something, and you hurt or kill someone as a result, you better be prepared to accept the consequences.
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