Elysium says that they will ignore any C&D and continue to support a private server until Blizzard officially releases one. Nano's recent blog reinforces this idea saying the ultimate goal is to get Blizzard to officially release legacy servers and the best way to do that is to make private servers super popular.
Essentially, Nost 2 wants to be shut down via a Blizzard announcement that they will proceed with legacy servers. So, if Blizzard makes that announcement six months from now (and it takes them a year to develop it), I wonder if the announcement will be enough for you to shut down Nost 2 for the sake of goodwill etc.
This is a heads up on the question I will be asking tomorrow.
In this context, I think I'll just play my old Nost toons (even though they are far behind) because I don't think you're envisioning this as a long-term project but rather, a project to simply put more pressure on Blizzard.