Even if Mtgox lost a large number of bitcoins, they can temporarily work like a fractional reserve bank until they recoup all the accounts with the 0.65% fee.
I think there will be a "bank run" on Mt Gox after this incident. If Mt Gox do not have enough bitcoins, some people is going to eat the loss.
I am glad I found something wrong with my account less than 24 hours ago, and I changed my password to 24 character long, and withdraw all btc at the same time.
I just found it unbelievable that so many people blindly trusted Mt Gox even with all the hints show up in the last few days.