As noted in the article, there are plenty of private buyers for these toxic assets. The problem is that the buyers want to buy them at $0.10 on the dollar while the banks want to sell them at far above market value ($0.60 on the dollar).

While the current bagholders have much motivation to get rid of them, they won't sell them at market value because doing so would render many of them insolvent. (Many of them are marking these assets at $0.60 on the dollar on their balance sheets).

So the Treasury is planning to help out the banks by giving these banks what they want - ability to sell the assets at above market price. (which results in a transfer of losses from the banks to the taxpayers)