I don't think changes are necessary in general, just the new 60-70 skills need to be useful for group content.

WHM is suppose to be heavy about elemental support so maybe have more things involving element.
A stone totem that increases resistances
A rejuvenating breeze that restores TP/MP to allies
A water puddle AoE DoT

Things like that would help inprove WHM's overall in the meta without having to nerf SCH.