If they keep the Server names I'm pretty sure they'll keep Balmung as the RP server (since it's pretty widely known that that is where the biggest RP population is and has been since it was called 'Besaid' all those eons ago) ; but my point was that if they changed the server names completely, which is a possibility; then all the RPers would flock to the RP labelled server since there would be no 'Balmung'
It's going to get even more confusing picking where you want to go based on data center too, if you have a specific group of friends that you wanna stick with then drag them with you ;;
You'll have to forgive me but your last sentence made no sense to me whatsover><
I do forsee that with the data centers etc we'll see a huge turnaround of who-goes-where because a lot of people will want to play on a server with less ping; the Balmung you once knew may not be there anyways at launch D: