Why not Glass-Steagell? You have an econ background right? I'd be curious to hear that kind of semi-qualified opinion.
The US was the only country in the world that still had those restrictions in place before the Gramm-Leach-whatever bill was passed. The act allowed banks to become more stable and diversified, and allowed them to better compete internationally with the mega banks you see in Europe and Asia.
If you look at the banks that were hit hardest by the financial crisis, it was precisely those that didn't take advantage of the law.