We've already invalidated two-thirds of the trinity, and this process started three expansions (seven years) ago. A lot of modern games have moved on towards an action MMO format with everyone doing damage and relying on either personal defensives or consumable charges to keep themselves up. Healers didn't object initially because they were content to play a simplified version of caster DPS in a role where half of the players either weren't trying or just didn't know how to deal damage. It's just become a lot more obvious to everyone else since Heavensward. It's a bit late to be showing remorse.

That's not a caster problem, though, and raise shouldn't be used as justification for a dps imbalance. I would much rather them just turn 'Potion' and 'Phoenix Down' into timer-based role actions across all DPS jobs, and just give everyone rDPS parity. If it ends up being a major issue they can adjust either the recast or the number of uses based off of fight difficulty.