Its the users that have value,.
If you give them something they can believe in, a little cooling off period and some incentives to use the new exchange it might just work out.
I have an account. I would never use it again. MtGox has tried the little carrot trick before by offering 0% fee trades for a few weeks. What are they going to do now? They would have to shower users with free bitcoins to get them to return, and even then anyone with any sense would say 'thanks' while withdrawing them.