Random Thoughts:

I would imagine being the only triple AAA MMO available on Linux when Steam hits would make a significant impact to the player base size of FF 14. The press alone might be worth the cost of getting the game running in Wine or porting it.

Mac OS is Unix based so if they have that down it might even lessen the work needed to get the game running on Linux.

As much as I like Arch, I would think SteamOS is the only distro they need to worry about. It would probably run on Ubuntu as well since they are both Debian based.