Oh don't worry, it'll be years before RO ends, plus you might join when the 3rd class jobs are implemented in the game, something that even in the korean version is still to come. Honestly, I don't think FFXI will last a long time. I just didn't find it interesting, plus the gameplay is boring. Not much action in FFXI, but whatever floats your boat. For final fantasy games, I'm just going to stick to the non-online versions, since story is what makes those games.
Edit: Oh yeah BTW, Ged, I just found out that the registration was opened for one more week, but it's going to close this Jan 13th. The fee is $10 for server maintance and other stuff. It would be kinda high for you since there is only 1 more month of Closed Beta, plus it's a beta (it still has some bugs). Once closed beta is over it will go pay to play.