I am sorry you have to go through this, but happy you see the benefit of it. Yes, he may get run over or wreck the bike. However, he won't be running over an innocent soul in a car.
Good for you. We were talking about this at work last week (I work in insurance). How really it is selfish when you drink or even we hear from lots of kids who know elderly mom or dad should not be driving but don't have the heart to take the keys away. Wow...I have worked so many accidents where those people have seriously hurt themselves or someone else.
One lady just drove through an apartment and killed her neighbor who had just given up her own keys recently. My heart was broken, how awful. The kids said they knew she should not have been driving but just could not tell her and take away her independence. Now she has the guilt of having killed her neighbor and friend.
Sorry for babbling along. I guess I am always so happy when people see the correct side of the coin so to speak on this.
Blessings!