I'm with the popular opinion represented on this poll.
We need/want RDM badly. A job that brings diversity in playstyle; the jack of all trades and the master of none. It would be easy to implement the melee and enhancing aspects of RDM, while the enfeebling spells will need a bit more thought.

Picture a class(Dualist) in XIV that can use weaponskills, white and black magic mildly and branches out into two jobs.

1) A Physical, assault focused power house -> Dark Knight
Using magic to strip foes of their vitality and absorb their strengths. Trades in their fencing agile and dexterous sword prowess for a heavier great sword and zero evasive abilities.

2) A Magical, Enhancing focused combatant -> Red Mage
Uses magic to enhance his own balanced combat style and is exceptionally good at enhancing the skills of other party members.
Haste and Refresh to name a few. Retains an acceptable melee level but its true value is the enhanced performance of the PT.