I do think the end of the Keynesian experiment is upon us, that unbacked fiat currency is collapsing. Just as every fiat currency has throughout history. It's possible that a US debt downgrade could trigger that tsunami, although it's likely a lot of people have worked long and hard behind the scenes to collapse it. One proponent of such a scenario or theory is Bix Weir and this radio interview from July 31 is a good intro:
http://www.davejanda.com/operation_freedom/
fast forward to about 1:17 where he starts