I'm old enough that I seriously doubt the world will run out of suitable used cars within my lifetime. My current car is from 2005 and still runs like new.
But if that day comes, I'll figure out how to disable the radio. If that's not possible, then I'll stop owning a car.
Do you recognize the drastic changes the world would have to see to prevent a dedicated individual from driving what they want in any half-way liberal legal environment?
The US, for example, allows one to build a kit car totally by ones-self, and the waitlist for VIN certification is fairly short. If you want to shortcut the VIN certification you can build a car on a car that has at least 30% of the original frame in tact and piggy-back onto that VIN number with proper certification. If that frame is older than the mid 70s, go hog-wild; you can operate it with a coal engine if you want to.
If you're a 'dedicated individual' that is concerned with having a modern car that is engineered well for safety's sake, then go buy a kit from the hundreds of companies that do nothing but engineering work.
If you're afraid that there will be electrification mandates, no worries -- there are hundreds of startups focused on the conversion of existing ICEs into EVs.
What I'm trying to say : a world locked down to prevent all forms of vehicular autonomy is a lot different than the one we exist in today; it's not something easily predictable to assume when that will end, given the many different venues one can explore to express vehicular autonomy and individualistic choice.
But if that day comes, I'll figure out how to disable the radio. If that's not possible, then I'll stop owning a car.