If the individual is so bad off they can’t manage to get on a (more robust than we currently have) form of public transit, I really question if they should be driving. The simple fact of life is that at a certain point, maintaining complete independence isn’t a reality. This isn’t a bad thing, we should be moving towards embracing building the systems we need for people to get help at that stage of life.
These people have no problem driving or taking care of themselves, I’m sure plenty shouldn’t be driving, but doing something like shopping and then walking your groceries back home simply isn’t an option for a lot of people even if public transportation was more robust. Sure, past a certain point everyone loses independence, but there are plenty that don’t need to that you are advocating should