Gotta rip off that band-aid! Every flunk is an opportunity captured to educate an under-trained driver or identify what is otherwise making them unsafe. It wouldn’t just be about taking these people off the road, it would be about making them safe enough to go back on it should they be willing to do the work required to get there. I had an ex who’s mom drove around without Rx lenses and literally couldn’t read the road signs. Just a rolling disaster waiting to happen. If she had to re-test she probably wouldn’t flunk, she’d just finally get her prescription filled. There are probably millions of situations like hers that simply having a test on the horizon would fix.