I've compiled a few ideas for the healers.

SCHOLAR
• Ruin 2 is replaced with Miasma - A casted dot with an 18 second timer and 50-100 potency on-hit (single target).
• Art of War/Art of War II – Is now a AOE instant spell around target and nearby enemies. The trait “Bane” is unlocked at level 56, which spreads the effect of Bio/Bio II from the target to all nearby enemies with a potency of 40% upon executing (with the same duration remaining) upon executing AoW upon target.
• Energy drain is now replaced with Shadowflare, which functions as it did in Stormblood, but can only be executed under the effect of Aetherflow III (does not consume a stack of Aetherflow).

SAGE
• Eukrasian Dosis spells have been reduced to 24 seconds.
• Addersting is now accumulated upon execution of any Eukrasian ability in combat, and can now be stacked to 4.
• Toxicon spells now cost 2 stacks of Addersting and are now DPS positive over Dosis spells.
• Phlegma spells now combo off any Eukrasian ability.

ASTROLOGIAN
• Combust spells now have a reduced timer of 18 seconds.
• Drawing a card now has a chance of granting either “Enhancement” or “Instant”, which now grants either enhanced versions of Gravity and Combust spells or allows the next spell to be cast instantly.
• Enhanced spells include: Enhanced Gravity, which now does 300 potency to target and surrounding enemies (potency gain over Malefic spells) and Enhanced Combust, which now lasts for 30 seconds and an on-hit potency of 50-100.
• Crown Play now replaces Minor Arcana upon the execution of Minor Arcana.

WHITE MAGE
• Aero and Dia spells now last 15-30 seconds (variable).
• Aero III is restored and upgrades to Diara at level 72 (aoe version of Dia).
• Divine Benison is now a level 66 spell, which when fully absorbed causes an AOE attack of 300-400 potency to target and 50-75% less to nearby enemies and grants “Blind” to target and all nearby enemies (duration 10 seconds).

Note that these potencies are just off the top of my head but these changes are really just to give some variation to healer dps.