Will we see a day when manually driving a car is as illegal and socially unacceptable as driving drunk or without a seatbelt? I'd guess so. Tech like this will become standardized along the way to full Level 5 self-driving.
There's a whole demographic of people aged 80+ who face restrictions on their driving as they age further. I would expect Volkswagen and others to be marketing car software along these lines tailored to their needs and problems.
Why are they making it so needlessly complicated? They can just use existing highways and vehicles with Level 4 self-driving. They don't need new separate roads.
That said, this points to the future. Even if true Level 5 self-driving is several years off, there is plenty Level 4 can do now. That includes all cargo driving on highways. I doubt most trucker jobs have long to go. Some will say they are needed for last-mile delivery. Some companies are soon going to figure out a profitable system for having human drivers locally for that, but self-driving vehicles for the long stints on highways.