A bit of history from late 1999:
http://www.nytimes.com/1999/11/05/business/congress-passes-wide-ranging-bill-eas... [snip]
Larry Summers who of course in now back in charge, said at the time:
''Today Congress voted to update the rules that have governed financial services since the Great Depression and replace them with a system for the 21st century,'' Treasury Secretary Lawrence H. Summers said. ''This historic legislation will better enable American companies to compete in the new economy.''
[snip]
Administration officials and many Republicans and Democrats said the measure would save consumers billions of dollars and was necessary to keep up with trends in both domestic and international banking. Some institutions, like Citigroup, already have banking, insurance and securities arms but could have been forced to divest their insurance underwriting under existing law. Many foreign banks already enjoy the ability to enter the securities and insurance industries.
[snip]
The opponents of the measure gloomily predicted that by unshackling banks and enabling them to move more freely into new kinds of financial activities, the new law could lead to an economic crisis down the road when the marketplace is no longer growing briskly.
''I think we will look back in 10 years' time and say we should not have done this but we did because we forgot the lessons of the past, and that that which is true in the 1930's is true in 2010,'' said Senator Byron L. Dorgan, Democrat of North Dakota. ''I wasn't around during the 1930's or the debate over Glass-Steagall. But I was here in the early 1980's when it was decided to allow the expansion of savings and loans. We have now decided in the name of modernization to forget the lessons of the past, of safety and of soundness.''
Senator Paul Wellstone, Democrat of Minnesota, said that Congress had ''seemed determined to unlearn the lessons from our past mistakes.''
''Scores of banks failed in the Great Depression as a result of unsound banking practices, and their failure only deepened the crisis,'' Mr. Wellstone said. ''Glass-Steagall was intended to protect our financial system by insulating commercial banking from other forms of risk. It was one of several stabilizers designed to keep a similar tragedy from recurring. Now Congress is about to repeal that economic stabilizer without putting any comparable safeguard in its place.''
[snip]
The White House has estimated the legislation could save consumers as much as $18 billion a year as new financial conglomerates gain economies of scale and cut costs.
Other experts have disputed those estimates as overly optimistic, and said that the bulk of any profits seen from the deregulation of financial services would be returned not to customers but to shareholders.