A possibility to safe nost would be if you co-op with blizz. Just let them take control of the servers, with a monthly fee to blizzard. Just like in retail. The nost staff will still be in charge of the servers and the community.
That would be a win win situation, a place for all the players who would want to play vanilla without the fear of beeing a victim of shutdowns and blizz will stick to its word in not creating or running a vanilla server while getting lots of money for their old content and with zero costs for them.
I know you cant arrange that in two days but i believe we would also be happy if you guys can rehost Nostalrious in a couple of Weeks/Months.
Please think about it. Lots of people would pay to play this game.