The discussions of cost of a a 'bike registry' sound familiar. The last registry proposed and implemented in Canada was the infamous gun registry. Costs for that were initially pegged at around 3 million dollars. Almost 2 billion dollars later, the costs are mounting and the new government is on the verge of cancelling the registry.
On a positive note, I work in a youth detention centre, part of which is used as an emergency shelter for troubled youth. One of our shelter residents was loudly bragging about the bike they stole the previous night and rode back to the shelter. One phone call and an hour later police were here to impound the bike and gather information about the thief. Possesion of stolen property charges are pending. Hopefully, the bike will be reunited with the rightful owner.