The way I see it, pending how the story in Metropolis goes, should Lionel Luthor be elected mayor, he would leverage the 'success' of the Vigilante Registration Act to push it to a state-wide policy and subsequently nationwide. At which point it could become a larger game story arc, but currently it's rather small potatoes and more of a threat than actually enforceable. 

Since y'know, politicians can't actually just say things and have them become law. There's a process and procedure for these things.