Not Darwin but Frankenstein, not intelligent but unwise
When the bank regulators by means of the Basle Accord decided to drive risks (and creative destruction) out of banks, and imposed their exclusively risk based minimum capital requirements on the banks, they drove in fact banking business out of banks. When they simultaneously also appointed the credit rating agencies as their Blackwater type overseers of risks they also drove bankers out of banks.
The current turmoil is therefore much more a consequence of a Frankenstein’s not so intelligently meddling with the banks and Darwin has nothing to do with it that is unless of course you refer to the bank regulators themselves.