That's not the worst case scenario at all.  We don't know if the filing even includes BTC.  We do know that fees involved in sorting out business bankruptcies tend to chew through enormous amounts of remaining assets and that unsecured creditors typically receive little or no return.

Without access to the information contained in the filings, all we know for sure is that legal actions in Japan will now be stayed (and legal actions initiated outside Japan will likely be rendered futile).