Two scenarios
1. They could be trying to set up a big fall when Gox goes down and buy even more cheap coins
2. They manufactured the gox debacle in order to buy up cheap coins at times like these
If Wall St want to get their hands on the lionshare of hoarded Bitcoin (some 10 million BTC), then $580 is not cheap coins. These people have the buying power to take a market position and then use their newly acquired selling power to drive the market down to double digits and hold it their for a seeming eternity waiting on hoarded coins to come out of hibernation and be dumped on the market, at double digit prices.
Wall St getting into Bitcoin is not going to be good for most little people because Wall St want to take as much value out of the pockets of other market participants as they can. They specialise in in this game and they will be victorious in this game should they decide to enter. Wall St is not going to pile into Bitcoin at these still historically very high prices saving the Johnny Come Lately November 2013 investments and further enriching all the other early adopters. No chance. These guys have infinitely deep pockets as far as Bitcoin's present market cap is concerned and have both the ability and the patience to shake a huge amount of 'hibernating' coin out of this market at ultra cheap rpices before allowing it to become appealing to Joe Public once again and allowing it to surge.
Joe public will ramp up the value of Wall St's Bitcoin holdings, not the other way around. Anyone who thinks otherwise just hasn't been paying attention to how this world works.