Restructuring the Roles alongside with Jobs would be pretty good for 8.0

In a dream world, they would make everyone greedy DPS baseline and have somekind of role subset skills that allow most or all Melees to swap to Tanking role and most Range&Casters to swap into Healing role.

However such large scale change is unlikely, so the next best step is to shift Healers into support. I'd rather see them throw buffs on short CD to teammates than repeat cast their one damage skill, if they are super averse on expanding the damage kit.