When MtGox goes back up you're going to a surge in volume at other exchanges. Think about how many big guys had in storage at MtGox before they lost most users trust...
Sure. People will move their coins elsewhere. Why sell 'em though, unless you've lost faith in BTC rather than gox? Bitcoin wasn't hacked, Gox was. (so goes the story anyway. Whether or not you believe it is up to you).
What the heck
are you talking about?
There is no one with an ounce of credibility (read: more than a common troll) who claims the Bitcoin Block Chain has been messed with/compromised/exploited/hacked.
Bitcoin itself is, and has always been safe and intact. That much is not open for debate.
You can suggest that Mt. Gox is running away with all our money -- that much at least has a shred of evidence.
But a would-be Bitcoin cracker would have to have more than 11 Thash/s of computing power to screw with the Block Chain and counterfeit BTCs. He would be better off mining BTC with everyone else!
Although difficulty increases DO lop off 1/3 of my income (as a miner) each time they happen, I must say there IS a rosy side to Difficulty Increases. They make Bitcoin that much more hacker-proof.