I don't agree.
I know Nostalrius story. I understand, Nostalrius was NOT a beta server. We played there a lot, yeah, okay.
But Nostalrius failed and died. Done. It was over.
Nostalrius Begins opened afterwards, but it's an another story, with other goals. If Nostalrius Begins die and then the team open an other server way more successful years after (hard to picture but hey, it's just an example), then it will also be a completely different server and I will agree to level an other character.