1) "I can't work on it, myself"
2) "It'll have terrible resale value" considering the life of batteries
3) It's definitely going to have a computer in it, and probably be phoning home all the time and that data could be siphoned to find out where I've been and how fast I've gone.
4) Cars with modern computers are scary easy to hack
5) I just don't drive
6) I haven't driven an electric car and so I have biases
7) I do very long road trips with very short pit-stops. Electric cars will never be able to do that (for some size of 'ever')
8) I'm over 60, and the technology won't be where I want it by the time I'm likely to leave this earth.
9) (added) I don't think we'll need to own electric cars. I think Uber or some other company will send out electric cars to us that will drive autonomously to their destination, and I think this will happen before I need to buy a new car.
There's several potential reasons.