They won't be putting red mage in anytime soon. It is a job meant to be highly adaptable to different combat situations, and the game is currently based on set roles. In short, they couldn't make a red mage that feels authentic in the current system without significantly gutting what made it interesting in the first place. If a role were to be assigned to red mage, it would be "support." They buff allies, can throw moderate cure spells, can use damage dealing spells to hurt groups, and do good single target damage with a rapier. If they went all the way with red mage, it could even tank by instead choosing defensive buffs and heals.