Yes because the world needs a whole bunch of new cyclists with little road sense trying to do a certain milage before their test... And you think taxing cyclists is a bad idea?
Yes, because then car drivers would become far more CONSIDERATE to other road users, you never know they may carry on cycling after they get their car licence for short journeys. That would mean less cars, less congestion in towns and less pollution, everybody wins, except anti cyclists... Also the more cyclists on the road the more road users will notice them (as you will regularly be looking out for them instead of just "seeing" them occasionally).