Are you sure?
To me is looks like this:
Loosening the regulations on US mortgages was a strong contributing factor to a global financial crisis.
Since then, tightening regulations on global banking has led to banks being much less likely to fail and trigger another crisis.
you are in for a big surprise the next time a crisis hits the market. And even if your statement were true, only a few banks crashing would lead to a catastrophic domino effect, because everything is very largely inter-connected. What we have done since 2008 is largely insufficient to consider the current financial system as robust.
The quality, timeliness and enforcement of the laws that establish regulation will determine the outcome.
Current regulation is weak, but society is better off with it than it was without it. A brief look at the history of the US financial system and its "crashes" may shed some light over this, perhaps even demonstrating that, if anything, regulation needs to improve (both in terms of coverage and enforcing).
With regards to financial regulation, I think transparency and data reporting are hugely important. Much regulation can be done by counterparties if they can have better transparency.