On a side note, Zodiac Weapons would probably see a use or something in Heavensward as well. Not exactly sure how it goes, but Yoshi-P acknowledged that it is hard work obtaining one of these Weapons so he will take note of the player's concern in Heavensward.

Specifically,

“ゾディアックウェポンストーリー”か、その続編なのか、武器を成長させていく遊びは、パッチ3.1から再開する予定です。
“ゾディアックウェポンストーリー” (Zodiac Weapon Story)
"続編" (Sequel)

Yoshi-P doesn't really specify whether it is another new story or a sequel to the current Zodiac quest, but something about weapon growth is scheduled in Patch 3.1