Root Cause: The wall erected or legal barrier established by the Banking Act of 1933 or Glass-Steagall Act that separated FDIC insured banks and Wall Street investment banks was repealed in 1999. This provided access of low interest central bank lending facilities to investment banks, (funding speculative trading of stocks, commodities, etc.), that was only accessible to FDIC insured banks.
Note: This coincidentally occurred in conjunction with the most significant technological challenge to face humanity, known as the Year 2000 Conversion (Y2K). This global event required a global liquidity infusion by central banks, to assist 192 countries with remediation. Stephen M. Apatow,  founder, director of research and development for the Humanitarian Resource Institute has been working with global infrastructure analysis and contingency planning since 1999. In cooperation with FEMA, the Humanitarian Resource Institute established the International Disaster Information Network (IDIN)  to assist global preparedness initiatives associated with Y2K. 
Secondary Factor: Deregulation of the OTC derivatives market and shadow banking system, that was used to fuel the speculative trading of the investment banks. This was accomplished through the "Commodity Futures Modernization Act of 2000." This allowed the unregulated shadow banking system, leveraged by investment banks, that now had access to central bank lending facilities (normally available only to FDIC insured banks), expansion to $1.6 Quadrillion or $1,600 Trillion in 2006. This represents the size and scope of unregulated distortions in the global financial system, that are now the target of OTC derivatives fraud and financial crimes investigations across the globe.
Why are the Banks still considered Too Big To Fail?
Because the investment banks have been allowed to remain connected to the FDIC insured commercial banks, extending the risk of the investment banking activities, that include the unregulated OTC derivatives market and shadow banking system, to the FDIC insured banks.
What are the solutions that can stabilize the U.S. and global financial system?
1. FDIC insured commercial banks must be separated from the investment banks, so that all legitimate FDIC insured banking activities, are no longer placed at risk. In 2011, this brings us back to the same solution, to the same crisis, that followed the 1929 market crash.... The Banking Act of 1933 or Glass-Steagall Act that separated the FDIC insured commercial banks from the investment banks.
2. All OTC derivatives in the shadow banking system must have 100% oversight by the appropriate regulatory agencies.
In deepest appreciation of Film Arts Integration Into Education, that has helped facilitate these crucial efforts to protect our life savings and futures of our children.
1. Too Big To Fail - HBO Docudrama - Film Arts Integration Into Education: HRI:UNArts Humanitarian Intervention Initiative, 18 May 2011. Url: www.unarts.org/
2. Leadership in the Face of Adversity, Against the Odds and Outside of the Box: On The Lecture Circuit: H-II: Stephen Michael Apatow, HRI: United Nations Arts Initiative, 12 May 2011. Url: www.unarts.org/
3. International Disaster Information Network (IDIN): Humanitarian Resource Institute. Url: www.humanitarian.net/
4. Year 2000 Conversion: Global Infrastructure Analysis and Contingency Planning. Url: www.humanitarian.net/
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Humanitarian Resource Institute United Nations Arts Initiative: Promoting the arts as a vehicle for solution oriented strategic planning and development across the globe.