I don't think EtherDelta is gone but they have to do a lot of work to make their exchange safe again. That will start with explaining HOW someone was able to hack their DNS servers. If they try hiding details or try blaming others for their own mistake then I don't think they will fully recover. But if they are honest about what happened and how they will stop it from happening again then I think users will come back because there isn't anywhere else to trade such a high number of ERC20 tokens, especially for newbies.

But it needs to be repeated over and over that all it would have taken to protect yourself from this hack is to be using either MetaMask or the even more secure BLUE chrome extension.

Either of those options would remove the need for users to enter their private keys into EtherDelta, thus protecting them from phishing attacks such as this one.