YoshiP never liked blue mage to be implemented to FF14, he highly disapproved it as a job, and implemented just for the fan base. Blue architecture isnt good for a mmo old style like ff14, is more a single player rpg style job. And as it is now will allways be just a mini-game job for 2/3 weeks content.. or less.
Blu will never be reworked as a REAL job, sad but true, it will just get a level increase to match with old content, some new magic and some unique content/minigame, thats it. Blu mage its just a mini game job to run old stuff for 2/3 week and then forget about his existance.