FFXIV actually doesn't need a second healer class. At least, not right now.

The question is "What would this new job do that WHM cannot?", and there isn't really a lot that they can do. WHM already gets two tiers of cures, an area of effect cure, and a heal over time. A lot of the responses people are giving are things like "Make a hybrid class that heals, like RDM or SCH from FFXI." Thing is though, we already have those.

How would a RDM differ from a paladin with cure set in any way? How is Scholar any different than a thaumaturge with cure set? Being a healer is mostly about that one ability. True, a marauder using cure isn't going to be as effective as a white mage, but anyone who thinks that a hybrid should heal as well as the best healer needs to have their head examined.