The team couldn't come up with a new plan fast enough because it was dogged by a lack of help -- the administration hasn't yet filled out the treasury department. Geithner simply needed more time. This is all according to a story in the Washington Post today:
WaPo: Just days before Treasury Secretary Timothy F. Geithner was scheduled to lay out his much-anticipated plan to deal with the toxic assets imperiling the financial system, he and his team made a sudden about-face.
According to several sources involved in the deliberations, Geithner had come to the conclusion that the strategies he and his team had spent weeks working on were too expensive, too complex and too risky for taxpayers.
They needed an alternative and found it in a previously considered initiative to pair private investments and public loans to try to buy the risky assets and take them off the books of banks. There was one problem: They didn't have enough time to work out many details or consult with others before the plan was supposed to be unveiled.