There is no possible way to enforce any of these suggestions that people have made in this thread. Shamefully, we have to put up with dickhead drivers in no matter what car they are in.
If you go along the lines of licensing as suggested in this thread, that would basically determine you need a special license for every car! Think about it; I find our old hiace van was a MUCH more dangerous car than our FJ62 Landcruiser! In the van you couldnt see on either side of you, and there was a massive blank spot in the rear, as most people on this forum would probably know.
How about the shitbox falcons and commodores? Eg VN or EA... these cars are 15 yr old shitboxes with flogged out everything. They are as dangerous to drive, if not more, than a large 4wd!
I learned to drive in a landcruiser, and practiced in a van. I feel that that was the best way to learn, as I have learned in the most extreme of cars.
My suggestion is this. If someone has a crash, regardless of car, they cannot return to the road till they pass a defensive driving course for the type of vehicle that they crashed in. At least that way, we can prevent further damage.