I think Support is the role but healer the name. We keep the healers as they are and we get an Enocunter Design change so that healing to that exten is needed or a more support role BUT this would also need a encounter design change first.
All encounter are build around DPS and low utility. If you are adding utility in form of a supporter the encounter would break. I dont say "no to supporter in FF14" but SE needs to aknowledge that the enocunter design is failed and needs a rework that first or all healer changes will be for naught.