I think it is a great idea. Of course you can't stop at just one type of license -

Tandem - The captain would have to have a class "A" license, and the stoker would have to at least have a learners permit.

21-24-27-30 - Each time Shimano or Campy decides to squeeze in another cog we'd have to prove that we actualy know how to shift, the whole idea of a license is to prove we know how to
ride, we better know how to use our new equipment.

Those bike big Shwinn trikes - commercial license, hey, you could be making 30to40K in as little as 6 weeks.

Unicycles - anyone who rides one of those is just a freak, they should be arrested and the unicycle impounded. (just a joke I ride one)

Next we could license those little crappy scooters and rollerblades and skateboads and sport
shoes - anything that can be operated on the street.

Joe