I actually like what someone mentioned about melee and ranged. Ranged can take the place of melee, but melee cannot take the place of ranged. If melee do less damage than ranged there's no reason to bring melee. Optimally you'd take as many ranged to every fight as you can even now. But currently due to melee dps(sam/mnk) and utility(nin/drg) you still want to keep at least two melee.