The problem, as I see it John, is that it won't just be the US that goes under. It will be the entire world, as 1st and 2nd world economies all become 3rd world economies.
Why? The world is currently based upon the dollar. Granted, some are beginning to leverage other currencies, but it's too little, and far too late.
Forbes has been hinting at this for the last 6 months (yes, I subscribe).