I think we will see this in the unchains if every player is pvp 10 and geared in pvp 10 armor. This is when you will see melee have a large advantage and priests and casters will be very upset asking for class re-designs.
I can tell you that from a tos perspective, it will take more casting to inflict damage and kill, therefore mana issues will rise to the top of complaints for this class IMO.