Actually, why not just have another Blue Mage update in 7.1 that increases the level cap from 80 to 100, and once reaching level 100, you can unlock Unlimited BLU (Tank), Unlimited BLU (DPS), and Unlimited BLU (Healer). Each of this offers a preset selection of spells with revamped effects that make them balanced alongside the other jobs of that role and functions as a normal job. Each version of BLU reuses animations from the spellbook, but all the effects are adjusted to feel balanced, and healer BLU is basically a reskin of the current White Mage--a very surface-level healer with no real complexity, and no real skill ceiling, but good enough to get you through all instances of combat. Meanwhile White Mage is allowed to develop a more well-established skill ceiling.
Anyone who doesn't like how simple healer BLU is also has the more Red Mage level DPS BLU, or the Dark Knight level Tank BLU. Limited BLU still exists and can be played outside of normal content for things like FATEs, the challenge log, etc. But anyone who wants 1 button DPS spam can just play healer BLU.
Some examples of what that could look like as far as skills:
The True Blue Gauge:
- Every second, the True Blue Gauge increases by 1 to a maximum of 100. when the True Blue Gauge is 20 or higher, casting any healing spell consumes 20 gauge and grants a charge of True Blue, allowing 1 use of Saintly Beam.
DPS Abilities
Water Cannon: 340 potency single target damage
Song of Torment: 80 potency single target DoT
Quasar: 180 potency AoE DPS
Stotram: OGCD 300 potency AoE DPS button that restores HP nearby party members, and restores MP to yourself. 40 second cooldown.
Saintly Beam: 680 potency AoE DPS in a straight line; requires a charge of True Blue
Healing Actions
Pom Cure: 500 potency single target heal
Pom Cure II: 800 potency single target heal
Pom Medica: 400 potency AoE heal
Angel Whisper: Resurrect spell
Exuviation: 200 potency AoE heal + regen (larger radius than current)
White Wind: 200 potency AoE heal that additionally restores HP based on 50% of your current HP.
Angel's Snack: OGCD 90 second cooldown that restores an additional 200 potency to allies healed with Pom Medica, Exuviation, or White Wind.
Transfusion: Single target OGCD heal with a potency of 700 on a 60 second cooldown.
Gobskin: Single target OGCD barrier and 10% mitigation on 30 second cooldown with 2 charges.
Other Noteworthy Actions
Condensed Libra: OGCD effect, increases your True Blue Gauge by 20; 40 second cooldown.
Chirp: Stuns all nearby enemies for 4 seconds and increases own healing magic potency by 20%.
Eerie Soundwave: Reduces damage dealt by all nearby enemies by 10%.
Something like that as a starting point. Anyone who cannot stand the other healers having more DPS buttons can play the new BLU, and anyone who wants a more complex BLU can play BLU as a DPS or Tank. Everyone wins.