Simon argued in the Atlantic article, and I argued in “Frog and Toad” and “Big and Small”, that the best way to regulate the financial sector is to limit the size of individual institutions. In the interests of providing a contrasting point of view, I want to point out that Kevin Drum thinks that small banks can do just as much damage as big banks:
I think crude bank size is a red herring for our current financial collapse. Small banks can become overleveraged just as easily as big ones, hedge funds pay higher salaries than Wall Street behemoths, the interconnectedness of the global financial sector is a bigger cause of systemic worries than size alone, and credit expansions spiral out of control largely due to lack of political will, not because Citigroup is large and clumsy. Those are the things we should be focused on.
Therefore, Drum favors systemic oversight and regulation (which I agree would also be good). Besides the first article cited above, he continues the argument here.