The new line of iMacs are more than capable of handling games tbh, and they don't even cost two grand. I played XIV back when it launched on my now 4 year old iMac through bootcamp and didn't have any real problems, to my surprise. Anyway, I wouldn't go out and buy one just to play FFXIV, that'll be silly imo, but I can see how others would want a native client and I don't think that'll be bad idea. It wouldn't be something at the top of SE's priority list but considering Blizzard and ArenaNet are supporting the platform, there obviously is a market for it.

And again, if you look at it from the standpoint of someone who already/only owns a Mac, it's silly to throw another $800 at a rig just for one game. Sadly, the fact of the matter is that the only way to play XIV on Mac at this point is to dualboot Boot Camp, and it doesn't help that Parallels and whatnot does not support Direct X, therefore making virtualization unfeasible for gaming.