You naysayers are no different than those who said the horse will always be the dominant form of transportation. Driving a car will become a leisure only activity on select roads and tracks. Like horseback riding.
http://www.saturdayeveningpost.com/2...tomobiles.html
The way I see it the change will be gradual. At first driverless cars will coexist with drivers and bad weather will require human drivers. But then certain expressways with terrible traffic will say no more drivers and only driverless cars that move far more efficiently than human drivers are allowed in certain lanes or during rush hour. Then a city will go to all driverless cars. Once that is successful every major city will follow suit and then the suburbs.
Likewise cars and roads will get better and better at driving in rain, snow, fog and weather. They will use a host of different systems; visual, lidar, GPS, radar, etc. Roads will have sensors that identify lanes, road friction, temperature, etc.