This isn't severe enough to trigger a full-out collapse.
This is a more orderly migration. While a steep drop today, it shows just how out of touch investors are with reality - as anyone with any lick of sense knows that the industrial and manufacturing prospects of the U.S. are, with few exceptions, a precipitous bear of a market.
They have now shifted their investments over into more "secure" holdings - various real-estate holdings, municipal and treasury bonds.
The real fun is when those devalue following the announcement that the insurance companies will be bailed out. That will trigger a run on the banks that will cause all kinds of chaos (though currency being as digital as it is, today, helps to alleviate the threat of bank-runs... at least domestically within the Federal Reserve cartel).
My bet would be on energy and shipping companies. Those are going to become exceptionally important over the coming years and will explode in value as truck-stops and train stations become the cultural hub of post-dollar America. At least for a few years, until replacement currencies begin to circulate more freely with more regionally recognized values.