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. 
The other factor to bear in mind is that a large number of potential creditors may not file a claim due to the legal ramifications of claiming those Mt. Gox accounts. Claims can also be disputed, and certainly MK's claim(s) will be. One estimate from a friend who has dealt with the accounts of a lot of the gambling sites is that roughly 50% of the accounts probably lie fallow.