Your reasoning for launching the established PvP realm first is deeply flawed.
You are worried too many people will leave the established PvP server based on your polls. But your polls dont actually prove anything besides the fact that many people want to make a new character.
Lots of people do want to make a new character and will be trying to do so when you release your servers. The starting locations will be nearly unplayable. I Remember the last time you guys released a server it took me about 8-10 hours to get to level 10. It was an experience i somewhat enjoyed because i was with friends, but i do not want to go through it again.
Funneling all the new players who are waiting for nost into one server instead of distributing the load evenly across all your servers is just going to make the experience of people making new characters that much less fun. If you did release both servers at a time then the people who want to make new characters would end up deciding that spending a half an hour on a single quest in the starting zone is not worth a "fresh start server" and they will make their fresh start on the established server or go back to their mains on that server.
For the new players nost is bringing in they will find the starting locations to be unplayable they will ask "why are there no other servers? isnt there anywhere else we can go?" and the answer whether you stagger your servers release or not is yes, there are other servers that are well populated and scripted out right now.
I had 2 60s on nost, that i have already gotten over. I wanted to make a new character on nost and i want to do it on a fresh vanilla server. but If you are going to be making sure that the release of your servers is going to be as unfriendly as possible for new players/characters then i would rather just sit the release of your servers out and play one of the other servers that are well populated and very well scripted.