The price dip is due to mtgox clossing once this sorted out price would be back to 800 or even much higher.
I agree that Mt. Gox has a lot to do with the downward trend, however that part of the dip proceeded the news, as such you could expect a further dip of about $100 just on the news of Mt Gox's death.
The market will rebound based on how the remaining exchanges react to the loss. If they take not overtly positive actions the rates will linger at a low price, however if they respect the loss then find a way to celebrate with the community the markets will shoot up like a rocket. The greater their celebration the higher the price will go.