Of course this is bullish news - there are about 850.000 BTC less in the market than what the market thought: Everybody on Gox thought they had BTC - when in fact they didn't.
So the market now lacks those 850.000 BTC which means less supply at same demand... You do the math.
No there's not, if they were stolen then there is still the same amount of coins in circulation either off market or already diluted in the market.
The only time there is less coins is if the keys are lost.
Mt gox customers were trading and owned imaginary bitcoins
Yes - but a lot of market actors actually have less Bitcoin than they previously thought (everybody with balances at gox). All those that want to replenish their positions will exert buying pressure on the market. Or am I missing something here?
But the majority of those actors who had particuarly large amounts of btc on gox were early adopters who arent going to go and drop 6 or 7 figure sums of money to replace their coins, not just because of the monetary costs but the loss of faith etc.
The other people who lost large somes of money will be daytraders and big investors who did it just for the fiat gains, they too are not going to go ah well lost 6 figures lets go buy some more.
The rest of the masses , who can afford to replace a coin or two , probably make up a much smaller percentage of the overall loss than most would think.