Some interesting news was contained in Square Enix's financial reports for this past year. It seems as though FFXI subscriptions have been declining since last year. Combine that with the worsening exchange rate and the result is a hit to the typical high revenue production from SE's Online Gaming Division. A supplemental information packet was put out with the report (only in Japanese) that indicated that SE was developing a game to replace Final Fantasy XI.
Does this mark the end of FFXI?
Popular opinion around the gaming community have sided with the idea that this news indicates that FFXI will be closing the servers with the launch of Rapture. However, SE has stated that as long as enough people play the game, they will continue to support it. Whatever the case, I recommend checking out the source to this post as a couple of their writers have contributed some interesting view points on the topic.