A great idea in theory, but so many drivers think that it's their right to drive and not a privilege, that it would get massive opposition if the government tried to make it law.
A relative of the family has a condition where they have dizzy spells, which can come on at any time. They have already had a car accident, which we suspect was caused by this condition. Luckily, no one else was involved.
Even after countless suggestions, from close family, that maybe they should give up driving, they continue to drive. They even get angry and irritated when the subject comes up.
It's the, it's my right, attitude that will continue to allow drivers on the road that are a danger to themselves and others.