There is and will never be any reason to require bicyclists to get licenses or to register bicycles. It is quite obvious that requiring drivers licenses for cars doesn't keep idiots from driving, at best it slows them down a little when they have to take the test multiple times. So far every car in existence can be started up and driven whether or not you have a license to drive. Bicycles are not as lethal as cars and it would be a complete waste of money and yet another needless restriction on individual freedom to regulate them in the same way. A better solution would be to require cycling/pedestrian traffic instruction to kids in school. Might as well learn something useful in those prison cells they call "classrooms".