That could be cool, but wouldn't it just equate to more burst damage?
I feel like the issues healers have right now is that battle design and healer design aren't designed in synergy. Battles are geared towards low sustained damage with occasional burst damage. So a healer in a competent group is mostly DPS'ing, then handling occasional burst damage and spot healing when DPS take optional damage. But healers toolkits are designed for healing heavier, sustained damage and occasional DPS'ing in between. Which is a bit back to front. They should either design healers around the current battle mechanics or adjust the battle mechanics so that healers are more pure healers than green dps.