With Goldman Sachs and Morgan Stanley becoming commercial banks, and the other three big investment banks/brokerage houses being acquired by commercial banks, politicians and the press won't have Wall Street to kick around anymore. Headlines now shout about a $700 billion "Bailout for Wall Street." Yet strictly speaking, Wall Street as we knew it no longer exists.

The conversion or absorption of all five of Wall Street's big investment banks into commercial banks raises several intriguing issues.

First...