I still want to see them lift an element from classic older games and create a healer from a "attack your own party members to heal them" mechanic. Back in the days, there'd always be a small handful of weapons/ways to accomplish this. Could even allow for a healer that doesn't need to be DoM. Although, DNC prolly woulda fit that bill best... (plus, obviously, at this point, that would also require creating entire new gear sets and progression. Bit of a shame, that, realizing all future healers will almost certainly be shoved into a "Mind is primary stat" role...)

But anyway, that option sounds to me like a grand way of making healing engaging. Basically, do the work of a DPS, but on your party. =p Combos, rotations for potency, AoEs, gap closers, the works.
Would require some consideration for solo play and otherwise contributing to group dps, but, eh, technicalities. Ones I don't need to consider since the idea will never go anywhere.