What I can see happening, which is a concern I've voiced before, about adding an actual rotation or burst phase to healers is that healers will be encouraged to not heal if it will interrupt the rotation or burst phase. No matter how dire the situation you will either be healed at the end of a rotation when it won't interrupt other abilities they use for DPS or not at all during a burst phase so they don't waste GCD or oGCDs if they have them for dps during that time.