You can rule this possibility out. The MtGox worked on fractional reserve (that means from the 800,000 allegedly "existing" btcs only 200,000 were found). Also the fiat will be used to pay for other things as well (ie: legal process, investigators etc). I estimate only 1/4 to 1/5 of my original BTC reserve back and you should do the same; if it's more then it's good for us... if not, we don't get (too much) frustration.