"can guarantee that what happened will not happen again"
Glass-Steagal, etc, kept the financial system stable and boring since the 1930s, all through the fantastic growth in real wealth after WWII up to Viet Nam.
It's only when the Repugs/conservatives starting deregulation in the early 1980s, that financial system became unboring, and risky. Boom! the S&L disaster.
Because the financial system and corps OWN Congress, both parties, serious, save-our-asses re-regulation simply won't happen.
There is already a bubble coming with Wall St buying up life insurance policies and bundling them off into ownership by capitalists to cash them in.