I'm actually working on this atm
Considering the sheer complaints about the destruction of job identity, I'm in favour of restoring them with secondary effects and a synergy buff that boosts the next gcd attack as a reward for healing. Tanks have some of their mitigation to be different despite being the same function (yes i know about rampart) and that is preferred by most.
Why should healers suffer further?
Example proposals:
-Leeches restores some mp to the sch. They suck blood after all and energy drain also drains the enemy's blood to restore hp and mp
-Esuna adds a weak shield equal to cure 1 as a nod to ff2 where it could cure KO with 1 hp
-Exalted detriment restores some health equal to benefic 1
-Sage's version should grant an addersting as a reward for cleansing
and all of these should reward the next gcd attack with double potency to make up for the gcd if they aren't going to mae cleanses worthwhile