The problem with this approach is that copyright laws are strictly Federal issues. It's one of the few powers that is explicitly granted to the Federal government. Where one could make an argument that states ought to regulate things like education or health care, you simply cannot make that argument for copyright. If we wanted states to be able to make laws regarding copyright we would need a Constitutional amendment.
The US Constitution allows the Federal government to manage copyright; it doesn't force it, so you could still make the case that it shouldn't (just not on Constitutional grounds).
From a legal scholarship standpoint, that would be an improper delegation of Congressional authority; it's part of the job description if you like, and thus an assignment of responsibility as much as facility. The word 'shall' is construed in law as a mandatory assignment, as opposed to saying Congress 'may' do something (ie if it feels like it).
