The don't buy it argument has never held up. Look at phones, the options for a removable battery, sd card slot, 3.5mm jack are all gone on all but the most primitive/weird models of phones.
If the general public goes against your preference then your preference will no longer be an option. For cars this likely means that the only way to get a car that isn't spyware/ad tech will be buying an old car before this happened. That option eventually becomes more and more difficult until you give up and accept whatever the corporations are pushing.
This is a problem of society zeroing in on the most convenient technology. You still today are not forced to buy a phone nor a car, but if you want any chance of making a living more than 5 miles away from your home (well, depending on how far you can walk or bike) you need both a cell phone for receiving work-related communication and a car for getting to/from work on time. The problem is that 99%+ of society sees that receiving cooler, better tech (like a faster phone or a more efficient car) is a worthy tradeoff for the issues that only <%1 of consumers aren't happy with.
I'd like technical progress to be in service of the user and all their rights, not of corporations that apparently value covering their asses above creating value for their clients. Legal measures ensuring the ability in all situations to physically turn off privacy-invading features, plus the right to repair and tinker, would be a good start. Forcing free software would be even better.