Clarification, four other jobs aside from Red Mage and Scholar.

WHM Cure V, Cure VI

Soulsoother (Puppetmaster): Cure V, Cure VI

Blue Mage: Plenilune Embrace (Belittle if it you want it is still burst healing category, and cry more on the Cure potency, you gain an Atk/Matk bonus from the spell. What are you doing with that Add-on gear anyways?)

Dancer: Curing Waltz V (Learn when to use it properly and you won't have a problem with the timer.)

Any one of the Hybrids + a RDM or a SCH can manage the curing load of all but the toughest category of mobs without any need of Cure V. Just because these are not your spam-happy classes does not mean the combinations are not viable. Even the non WHM jobs can handle specific curing loads for NMs and events on their own of the circumstances are right for it.

If you need spammed burst high damage curing, then of course you would need the curing specialist (Read:WHM) or you would need better damage mitigation.

This idea of approaching an event with brain-dead melees with paper thin defenses (Read, little to no PDT/MDT gear), and complaining that your cure power isn't high enough to make up for bad defense set ups and tactics isn't intelligent game development or even game-play.

For Red Mage, development should take the route of providing better damage mitigation, not taking on some arbitrary spell that pulls RDM further away from being the enfeebler/enhancer everyone's crying for them to be.

I've yet to hear a valid argument for more burst curing jobs in general play in the game that doesn't amount to lazy invite habits and the cure version of BNS. Seriously, why would you want Cure V over spells that would PREVENT more damage? Same goal met, different method, and more usefulness in endgame events in which you're going to end up with a WHM + RDM anyways, and this way you're wasting less HP cured than if you both wound up hitting Cure V and over-topping the player.

Because at this point, you might as well call it as a decision between those two solutions because the likely won't develop former due to balance issues if you give RDM the latter.