That's a completely different take on the financial crisis than anything else I've read. The history of the financial industry is one of the industry finding ways around existing regulation, over-leveraging itself, and then crashing.
Financial panics were a common occurrence before there were regulations. You're saying that less regulation would create a more stable system, but that historically has not been the case.
In other words, for what you're proposing, we tried it and it didn't work.
Which also included a financial crisis and recession roughly every 10 years and ended with the Great Depression. How much faster would the economy have grown if it hadn't been plunged into recession once a decade?
...and now you know why things went to hell in 2008.