I know this is off the OP's topic but I had to add it.

If you ask me, I see potential for a DD job as CNJ's second job. They have elemental magic already. There are 2 "top" tier magics in game with BLM, those being Flare and Freeze. There are 6 in total throughout other FF games, Flare, Freeze, Burst, Flood, Tornado and Quake.

Obviously Burst would fall into BLM whenever the level cap increase comes or they just opt to add new skills. But what about the last 3 Flood, Tornado, and Quake? Those 3 are the based off the elemental magics of CNJ. So there is a base already for it to expand into greater damage dealing magic for a new CNJ class.

As for another healer job? One option is they do something not based off a previous FF job? Where would it branch though? Currently for the mages, ACN has SCH and CNJ has WHM. THM just seems hard to transform into a healer unless it's some sort of HP draining/sacrifice setup. If all else fails I guess, add RDM off of GLA or new class and make it support healing. Give it a heal relative to Cure1 and Physick with actual DPS skills. Or maybe a on/off switch like Cleric Stance that lets it fight or heal?