How about those who have lost some bitcoin and are waiting to have it recovered and returned get to mine for free untill the balance is restored, each trade would chip a little off the owed balance. That would go be an honourable damage limitation exercise, those who are not effected by the hack or had no BTC at the time, they continue trading and the fee's they pay will go towards keeping the exchanges head above water. Its less money for the exchange in the short term but its meeting somewhere in the middle of taking deposits and addressing the imbalance of stolen BTC.

We should all share the risk of a new adventure and not put too many straws on the camels back else it might break.