As well as being able to track every move you make
Then when a power grid goes, wireless communication is disrupted it all goes to hell rather quickly... That sort of thinking is making the human in us more dependent on technology and less with our own instincts. The world and everything in it will never be perfect and people should stop trying to push for that. For me driving is a privilege that I've always appreciated/respected and **** sure won't have some lame AI system trying to do it for me.
IMBHO this sort of car related technology is getting like the modern cellphone. Yeah look at how much can be done with the modern phone compared to say 8-10 yrs ago. Then look as how pathetic battery life is as well as function/longevity as these days even with moderate use/great care it's tough to get the latest/greatest phone to last 3-4 yrs if you're lucky.
Vehicle to vehicle communication is on a different band (I have to check which one FCC allocates for it but it is not cell phone use), point to point, instead of to the carrier tower then back to another vehicle.
You also can use a cord going from one car to another car, like, your tow hitch and brake light signal, you know? It is not a big deal having a wire going from one to another and make it a virtual trailer. You can probably have the turn signals and rear view camera of the last car shown on your dash just like when you are backing up, it is actually pretty useful if your rear view mirror won't see that far.
Battery life is a matter of what you buy. If you get a cheap $100 phone for free when you sign a contract, don't expect good battery life. Your car battery is fine for 5 years right? Do you want to go back to crank starting or push it to a running start in 2021? What makes you think self driving car (with gas engine) will run into battery life problem?
This phobia is why the driverless car will go commercial vehicle first, you can never argue with money and profit but people wants the good ole days to stay forever will always argue with you. Will human driver be perfect? I'll not bet on that but I know if I can avoid drunk drivers I would do it. I would probably be happy if a drunk driver can let his car drive him home instead of trying his luck and end up crashing into someone. If one lane on the highway have checkmarks for driverless car to read, and they stay 3 seconds away from human driver, with no pedestrians to look for, I don't see why would we not be able to get it working already today.
Oh, the government already track every move you make, from traffic cam and red light camera, and speed trap, and your past traffic violation history, and insurance claim, and every gas station has security camera these days, and E911 knows your location, and local cell tower knows where you are at approximately, and your EZ pass records, and the toll road you got on and off. It may save your life if you drive drunk one day and fell off a rural mountain road. Maybe your apple watch or iPhone would call 911 for you if detects a car accident (throwing the phone around inside the car, must be an accident, call 911 asap and tell them), and save your life. It's not all bad.