Non sequitur. The core idea is that if you have just self-driving cars you won't be trained enough to drive properly next time you're caught in a blizzard, because you never drove for the last 5 years.

I also question if the kind of person who actually drives while drunk - knowing perfectly by thousand of society inputs and peer pressure that it is wrong - will care enough to buy a self-driving car.

It doesn't, but I'm not going to trust my own safety to a self driving car that can only be said to be better than the worst drivers. It's a bad baseline.