Holy isn't the end all and be all of WHM damage. Its not only cosumes more MP then any other attack, but it only really makes up for that with atleast 3 enemies being hit by it...and since apparently we will only want to fight 1-2 enemies at a time in Heavensward, it won't be quite as good. The new attacks will probably be good for this, or for quick AoEs that don't consume quite as much mana (I'm assuming the new Aero is an AoE, thats what it looks like atleast.)