3. Not sure what you mean. But if gox really double paid some customers, they are the one to absorb the loss (or they will close and run)
Actually they may try to recover some, if they are able to figure out who did that. But I wouldn't bet much on it.
Also they may go into liquidation in a civilized way. That would be the best option for everybody. Bitcoin foundation should use all their influence to pressure Mark to do that.