That reasoning hasn't ever been valid because it wouldn't make haste any better for melee than it currently is for ranged, caster dots already have quadratic dpet scaling with haste, and censure scales with haste anyway. Sometimes I feel like blizzard have a worse understanding of the mechanics of their own game than we do.
Have they specifically stated that dots that don't currently scale with haste will scale in wod? This is the first I've heard of it.