If we get official legacy servers, it would be stupid to think we'll get to keep anything from Nost. But it would be even more stupid to complain about it. Did you forget the entire reason you played here in the first place? Official backing is the best thing that could happen to Classic. Starting over isn't much price to pay, and neither is the sub they will most certainly charge you. If you were willing to start over for risky private servers of questionable security or longevity... an official one shouldn't be a problem.
I just hope the problems we had on Nost aren't repeated. I don't just mean performance issues, but also the long lasting issues they ignored with spawn timers. They let players suffer all last year over herbs, nodes, devilsaur, blood of heroes, demon/priest spawns, the list goes on and on. It was a fucking nightmare to get stuff at 60 past the first few months. We had to beg and beat into their heads that 5x the population should have a lower CD than normal. Things like Devilsaur were ridiculously expensive, along with potions you needed to raid. Farming blood of heroes and the 4 demons for my Hunter epic quest was the most miserable time I had on this server.