Y'know, I transferred my main RP character away from Balmung to Omega when it opened. I am getting more RP there than I did on Balmung - while there are fewer RP events on Omega they are all during times suitable for my timezone, unlike Balmung where 95% of the events happened in the middle of the night for me.
RP does not require A central hub. It does require a certain critical mass of people to really be viable and sustainable, but the RP community in FFXIV is large enough to sustain more than one RP server.