Welcome! I don't think anyone here will be offended by the idea that drivers should have to demonstrate their competence to keep their licenses. However, I do have a couple of comments.
First, you've posted your thoughts in the Vans & Minivans forum. Granted, there is no Motorcycle forum and there really should be. I suggest that you post this in the General Automotive forum here in the Cars section, which is at http://www1.epinions.com/msg/show_~topics/cat_id_~3/id_~124
Second, the US Congress doesn't make traffic laws; state legislatures do that. I thought there were a few states that require older drivers to at least get a vision test to maintain their licenses, if not an actual driving test. To really make such a law work, you'd probably have to get at least half the states to enact it.
Anyway, you have a good start for a conversation. Welcome to Epinions.