With the announcement of the FFXI themed alliance raid coming in Dawntrail at the London Fanfest, I expected also an announcement of the return of the shared sub for both of the Final Fantasy MMOs that was offered during 1.0.
The separate sub for the game has been one of the reasons why I have not given FFXI a try yet and with how few people shouted from the crowd at Fanfest that they'd played XI I think it'd be a great way to get more people and revenue into that game as well.
The FFXI developers have already expressed their interest in bringing the shared sub back in their Reddit AMA last year (link below, 6th question)
https://forum.square-enix.com/ffxi/threads/59667
which is why I'm posting this on the official FFXIV forums to try and get the development team on board! Maybe the FFXI-included sub could have a few dollars/euros/equilevant currency worth of upcharge or bundle it with the Standard subscription.