Edit: Bitcoinica is still in the process of refunding everyone from the last breach when this happens.
The site has been offline for months, lots of people are simply caught waiting for a refund.
So basically there's nothing they can do now, if Bitcoinica's operation gets hacked again (their MtGox account this time).
Edit: Bitcoinica is still in the process of refunding everyone from the last breach when this happens.