for the sole reason that the funds stolen were mostly users deposits
customers do not "need" to pay exchange fault,they will want to recover their money
there is no other way for a business to compensate other than issue IOUs and slowly (but surely?)
repay the ones who lost their coins,although this is going to be one hell of a task,their profit was 1.8 mil $ before the hack
and after the hack the traders confidence will be low and many would flee the exchange,so expect 3-4 years if not more