Not gonna happen. Those fears are vastly overblown. Is it possible? Sure. It’s also possible that you will be eaten by a bear. This does not mean you should live in fear of the woods.
Someone probably is. It’s probably not getting much public exposure because 1) if you were figuring out how to stop bad guys from doing bad things you probably wouldn’t want them to find out how you were going to stop them, and so you’d shut up about it and 2) it’s one of those cost/benefit things. Tons of resources aren’t going to be poured into this because you’re much more likely to get a computer virus than you are to have your car taken over by a bad guy, and so the security money is going to by and large go to the higher security threats.
Furthermore, when these electronics fail, they are expensive to replace.
Even if you deleted all of the convenience electronics, you’d still be looking at a big repair bill if the body control module fried. And if you’re thinking “well then I don’t want a body control module” then you’re also thinking you don’t want air conditioning. Or headlights.
In short, there is no such thing as your dad’s old 1950 Pontiac that ran purely mechanically and didn’t have any computers running anything.
And overall, this is a good thing, because your dad’s 1950 Pontiac got poorer mileage, was less powerful, less maneuverable, required more frequent maintenance, broke down more often despite keeping up on said maintenance, roasted its occupants in the summer, fogged the windows over in the winter, had headlights that were little better than oil lamps, a steering column that would spear you through the heart if you ever got in a front-end wreck, no seatbelts, or airbags, and exposed you to a neurotoxin every time you fueled it or turned the engine on… And wore out much sooner than a modern car.
Sometimes it’s worth a little electronic annoyance to get all of those gains.
There is, actually. Cops can tap into it to find you if you go missing. There’s a missing guy in my area right now. The cops are looking in a specific county miles away because his cell phone pinged on cell towers there.