Why don't SquareEnix start bringing up some Synergy between a Paladin and Monk? I don't know how your rotation would change if a Blunt Resist Down was added to one of the combos from Paladin and there would no longer be a need for DK, but the biggest issue is the lack of Synergy Monk has with other jobs.

That way, you can go WAR DRK PLD NIN, or WAR PLD DRG MNK. Warrior buffs Paladin, which buffs Monk. Synergy, that's what is lacking, not the monk itself, the rotation, the single target or AoE output, not it's sustainability or mechanical failure.

A nerf to Greased Lightning is pointless - It would make it even less appealing. A buff to greased lightning, by a further 5% will officially put monks equal or greater than Dragoons in the single target environment.