Gox's 200,000+ btc is going to be liquidated soon, and that could be bullish or bearish depending on how you look at it. Some people view the recent positive assessment by financial analysts as bullish. I don't really see much on the horizon right now that would draw the masses that we'd need to go from $500 to $5000. The average person who had heard of btc has only heard negative things about it; hacks, stolen coins, drugs, nerds, etc.
How can a sudden rush of supply be good?
If liquidating you do not want to kill the market unless you want to kill bitcoin.
True that this would cause a sideways market for a long time if they dump the coins for fiat.
On the otherhand if all goxxed get their BTC then it could trigger more trading, hodling or usage of bitcoin which is good.
And also it is good that people might get some of their coins back. More user confidence. They probably wouldn't all sell because the price would start to drop and those buy walls would kick in. The smart ones wouldn't dump right away, they would just hold until the price goes and then maybe sell a few.