That the two best options stated above - create an alt on the server their on and jump potion or if they're on a preferred world, you can move off Balmung for free.
People aren't willing to move off Balmung, as such it going to remain locked.

Personally, I moved off Balmung. There were people I wanted to play with who couldn't get on the server, plus I wanted a house so these two things pretty much won over staying there.
It sucks having to decided between leaving a server you enjoy or playing with friends more then just over cross-server. It just how SE rolls sadly.