I don't think there is much that can be done. Those coins are lost. It's best to move on and learn that keeping large sums of BTC in online wallets, exchanges, etc is a bad idea.
This. Cryptocurrency is not for fools. Personally I'm glad most of the fools and weak hands have been shaken out by scammers and thieves - it was bound to happen anyway. Better it happen in one big, early crime than happen over many smaller crimes over a long, painful period of time. That scenario would be far more damaging to Bitcoin in the long run.