Well, they could do one of two things to fix this problem in my opinion.
1. Create a new RP server that allows for both new and legacy players, and offer free server transfers to legacy players at launch.
2. Label Balmung as an official RP server and, once again, offer free server transfers to legacy players at launch.
That way, those who want to RP can have their own server and those who don't want to RP can leave.
It might break up a few of the more casual linkshells with members who haven't stayed in contact since 1.0 went down, but it's the cleanest way to solve the problem.
1. Create a new RP server that allows for both new and legacy players, and offer free server transfers to legacy players at launch.
2. Label Balmung as an official RP server and, once again, offer free server transfers to legacy players at launch.
That way, those who want to RP can have their own server and those who don't want to RP can leave.
It might break up a few of the more casual linkshells with members who haven't stayed in contact since 1.0 went down, but it's the cleanest way to solve the problem.