Would Discipline Priest Mechanics work in FFXIV?

[Duelle]

I want a healer that converts damage into healing like Disc, I had a lot of fun in pandaria just doing DPS and it healing people, the shielding was also nice-but we already have that with scholar...I want the atonement mechanic. That's really all I mean here.

Doesn't even have to be a 'main focus', I'd settle for it just being a helpful gimmick.

Fair enough. Of course, with the DPS obsession raids have so that they can push content, it's going to create a problem unless you do something like making Atonement only work when out of Cleric Stance. Even then, if having our Disc analogue increases raid DPS, Disc becomes mandatory and WHM, AST and SCH get to fight over who is the second healer in an 8-man group.

[Reinha]

Fair enough. Of course, with the DPS obsession raids have so that they can push content, it's going to create a problem unless you do something like making Atonement only work when out of Cleric Stance. Even then, if having our Disc analogue increases raid DPS, Disc becomes mandatory and WHM, AST and SCH get to fight over who is the second healer in an 8-man group.

Make Disc automatically heal a bit smaller heals than a fairy for every damage cast (which come a bit faster than a fairy's heals). Make that heal be a reactive or absorbing shield on a random target that overwrites and prevents the application of SCH/Noct shields.

This ensures that:
1) Disc will be a competitor for SCH for the off healer spot. If its passive healing while doing dps is exactly as good as a fairy then there will be no problem. If its active healing is exactly as good as a Scholar's active healing + the fairy (gimped raw healing and some gimmicks + passive heals) then there will be no problem. Think of atonement as the replacement for what the fairy does.
2) It won't be a good idea to have a Disc and a SCH for their dps. If taking both off healers is a bad idea, then AST and WHM still have a place in the meta. Every healer would have an equal chance for a raid spot (50%).