The problem is basically the "Pure Healer" concept they applied for ShB. This is different for the other support role (tank). All skills for these support roles are split between the support skills (tanking skill and healing) and dps skill.

For the tanks they pretty much harmonized the tanks skills (to the point where the only major difference is the invuln skill). They are differentiated by the dps skills they have which make out a huge part of the skill sets.
For healers they went the other way by pretty much harmonizing the dps skill and they trying to differentiate the actual healing/support skills. But there aren't so many way for healing skill, either you prevent the damage from happning (shields) or you repair the damage afterwards (heals, regens).

As long as they keep it that way I don't see a new healer happing soon.