This is something most likely to happen in the long-distant future if they wanted to emulate FFXI.

With different tiers of Artifact Armour to obtain, with the current plan being

AF1
AF1 Myth (Being of the same model, with different textures

AF2 a whole new look set of AF gear, similar to how FFXI added in new sets.
(I'd wager an AF2 (+1) similar to how we have AF1 Myth gear currently happening here too, or perhaps they'll do something more interesting than a token system, who knows~