I read this article (from Tamar's hometown) and had the same thoughts you'll have, I expect.
One, how can they register all those bikes? One point five, will compelling cyclists to register their bikes really cut down ridership? Two, how can they enforce this? And three, how else can they police the anonymous thousands of scofflaw cyclists on city streets 'n' sidewalks?
I wonder too how long folks thought they could get away with wholesale pissing-off of the public without a slap on the wrist or a traffic citation.
Will bare-bones urban bicycles now have plates but no brakes? Will riders protest by climbing off their bikes - as bikers did when helmet laws went into effect?
Note the comment about Minneapolis....