The only problem i see in this scenario, is the fact that by making them not stack at all groups with more then one elemental shaman(assuming non dualboxing) will have a wasted talent that is supposed to be rather game breaking for them as are the 31 pt and 51pt. Making it stack unlimitedly raid wide is rediculous and unfair obviously, i believe (bias for multiboxers) it should not be able to stack more then 5 times or a party can get it stacked up to 5 times but the raid only recieves 1. I know it is a farfetched arguement but damaging abilities stack such as vampiric touch and each priest can regenerate mana almost unlimitedly, i don't believe thats been buffed raid wide but it still effects then entire group of people who are specced for it. now imagine only 1 priest could vampiric touch, then 4 other priests would have a wasted 41 point talent, much like this scenario is translating into. Once again a farfetched comparison but noteworthy nonetheless.

Raid wide this is unfair but in a party it shouldn't matter. How useless would healingstream totem be if it didn't stack, id use it because there aren't enough other totems but point being its not that good, and what about damaging totems such as searing, they don't provide a buff but using 5 of them can be considered stacking as they are all functioning independently of the other and aren't gimped by the fact that there are replicas. Same with tremor and grounding totems which would stack unless blizzard caused 1 spell to consume all grounding totems.

But 24 grounding totems isn't fair either as casters would be a joke, u could be in greens at 80, any boss who only casts spells wouldn't have a chance.

Anyways, im rambling, they should rework the totem if making it non stackable is the only solution due to ToW's new power.