Not 100% true. Once you are logged into FFXI, it runs live service and the Playonline service simultaneously. If you were already in FFXI and XBL goes down, you will still be able to play. However, you're screwed if you decided to /shutdown, because you wouldn't be able to log back in. I'm nearly 90% sure this is why we aren't seeing a port to 360, because of this bypass and truly no need for the XBL service.
