Accredited investors aren't asking for this change. The participation of private investors (of any net worth) in regular equities was a non-factor in current financial troubles, or indeed any financial troubles of recent decades.
If lessons from the recent crisis are what's motivating new net worth requirements on investments, how about new rules to block submillionaires from buying homes? That's be more rational as a reaction to the mortgage bubble than blocking millionaires from investing in companies!
(I don't expect even lame-duck Dodd to tell average Americans they're too easily duped to own homes; we should be equally outraged he wants to tell millionaires they're too easily duped to make private equity investments.)