People will need licenses as long as there are personal vehicles.
Most commercial aircraft are already automated yet we still have licensed pilots that fly / babysit them. Autonomous car technology does nothing for driveways, dirt roads, parking lots, construction zones, network failures, towing, launching a boat, etc... Cars in the future will always have a manual mode, and in order to get into one and go somewhere, there will still be a requirement for a licensed operator. Freeways and highways may become automated driving zones but there is still a need for a manual mode on those as well. Unless we get rid of all personal vehicles, we will all continue to have and need drivers licenses.