Unlikely to ever happen, given the nature of Linux (fragmented and extremely poor GPU support) and the fragmented nature of Wine (Which includes the wrapper used by the Mac version of FFXIV.)

I know it's a joke at this point, but nobody plays games on a Linux machine. Android doesn't count because it's not a "Linux OS" it's a proprietary OS running a Linux kernel and some OSS to not reinvent tools that are common on to all *nix systems like OSX. People play games on Mac's but Apple's complete ignorance of the gaming community kinda puts it in this wacky position of being able to play more games than Linux, but less games than it's Mobile fork iOS. Even though ALL those games have to compile and can compile on MacOS.

People who play games on Linux, do so because they have a political knife to sharpen against Microsoft and little else, thus many of those who ask for Linux support can't even point to a Linux distribution that will run existing games with Linux ports of of the box. Even Steam appears to have abandoned it's SteamOS based on Debian, with more than half of the issues still open. That's why developers don't take Linux development as a first-class citizen seriously. Some software developers release a "Linux" version that only works on one flavor of Linux, that which Steam supports (Debian) and if you don't know how to launch Steam on Linux, you aren't going to get those games on any other flavor without jumping through a lot of hoops.

Given the propensity of people to gnash their teeth at even the easiest of technical support questions, it's generally considered that Linux ports of software are "unsupported" and "use at your own risk" since the developers can not test on every distribution or fork of that distribution and may only test on their one linux machine in the office.