The banks will love Bitcoin. Has anyone ever thought of that possibility?
The banks have love/hate relationship with lawmakers: they love their protection, but hate their regulation. Bitcoin may free banks from regulation, but it will leave them without protection as well. Banks worked long and hard to get themselves in their current position and I doubt they are willing to give it up.
There's an alternate theory that once you are established you actually love regulation because regulatory compliance places a larger burden on smaller operations giving larger operations a competitive advantage.