I do not see a massive dollar devaluation in the near future. Eventually, yes. In the short/medium term, not really.
The amount of deleveraging/credit destruction is far too great to allow for meaningful devaluation of the dollar right now. Only when the US Congress or the US Presidency control the printing presses I can see that happen. As long as the FED controls the printing press, their ability to inflate is severely restricted. Bernanke would love to inflate right now. He has actually been trying really hard to. He just can't do it, because the banks are the bottleneck. Now, once the politicians get control of the printers....