Astrologian already is FF14's Time Mage. The level 60 quest is about them eventually being able to manipulate time itself. Celestial Opposition is an AOE Stun that is supposed to be a short time stop, and so is Astral Stasis. Gravity also is a spell often associated with time magic, and they even get Time Dilation as a skill. If we ever get meaningful CC in this game I fully expect AST to get Stop.
No fun. =/