We can certainly create much more effective systems of accountability than having a single point of failure who we threaten with legal action to keep them honest (just splitting up executive and treasury functions is already a huge improvement), and like I mentioned, that doesn't defend us against buses.
I think we can all agree that empirically, this single point of failure plan didn't work.
I mean, they can be held accountable. That's what law enforcement is for, to hold these people and firms accountable.