I was commenting on the lack of competition. Deregulating with the aim of making the barriers to entry into the marketplace smaller. Not deregulation to allow big banks to get away with more...
Also, I would guess with more competition from smaller banks, megabanks might actually act more responsibly.
[EDIT] but you are kind of proving my point, so thanks! I said "deregulation" so your mind is already made up on the point.