FORTUNE -- Would JPMorgan and Chase really be more profitable if they parted ways? It's not clear. Sandy Weill seems to think so. Yesterday, the man who spent the 1990s building the behemoth Citigroup (C) went on CNBC to argue that not only would the nation be better off if the banks were broken up, the banks would be too. He said the traditional lending side of the banks would be more profitable if they were split from the Wall Street trading and investment banking divisions and visa versa. Wall Street's bottom lines have been hurting lately. So any plan to boost the financial firm's profits should be welcome. The problem: It's not clear the Weill plan would do the trick.

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