"New financial rules might not prevent next crisis"
This is guaranteed. The very existence of the next crisis means that it won't have been prevented, by definition. Unless we never have another crisis of any kind ever again, then nothing whatsoever can prevent the occurrence of the next one, whatever it happens to be. "Next crisis" carries with it the inseparable property of not having been prevented. Preventing a particular kind of crisis is worth doing, but preventing the "next crisis" is an ontological impossibility.