Maybe Sage will turn out to be that type of healer, but ultimately... the role is to be a Healer first and foremost. All the "intricacy" should revolve around healing. Obviously SE would need to make some fundamental adjustments to how content is designed so that healing was necessary much more of the time than it currently is, but I'd rather SE devout time and resources to making healing more interesting for Healers rather than devoting time and resources to expanding the dps aspect (unless that dps aspect is part of how the healing happens such as in Sage's case).