Artifact Armor shouldn't be much of a difficulty (and looking at S-E's progress with AF from Original/Zilart to Aht Urghan to Wings, the new jobs' AF should be pretty good) but Relic and Empyrean might well be a difficult chasm to bridge. It was a difficult enough stretch to fit COR, BLU, and PUP into the Dynamis lore to get Relic gear and an even longer reach to get DNC and SCH Empyrean Armor (was there even a Crystal War in Abyssea?). It's safe to say that GEO and RFN may not be able to get Relic (Unless S-E really reaches to extend the Crystal War to Ulbuka) or Empyrean (Does Ulbuka even exist in Abyssea?) Armor sets.