The best overall regulation the U. S. could impose is to limit the size of every financial institution so that the possibility of out right failure guides every actor.
Atif Mian and Amir Sufi's House of Debt reviewed in today's New York Times appears not to have given a second thought to the concentration of the banking system that lead toward the 2008 crash. The complete reliance on third parties with no skin in the game is the culprit and is what is required to reset.