Hildolfr
It's a big hammer.
Hmm, I don't think there's any concrete source that says when the Green Pact was drafted, right?I think I can relate it to real life, maybe... For example, in the Bible, Deuteronomy 22:20-21, it says, "But if this thing be true, and the tokens of virginity be not found for the damsel: Then they shall bring out the damsel to the door of her father's house, and the men of her city shall stone her with stones that she die". Now, Christians obviously don't stone non-virgin wives anymore, because as civilization advances, many practices that were believed to be just in a more lawless society, are simply no longer acceptable.
I think this could be the same for the Meat Mandate of the Green Pact. In Valenwood, you find a much more barbaric and simple society than across Tamriel, which is why most Bosmer will only find their cannibalism accepted in Valenwood. Also, I would like to point out that even if cannibalism was not illegal in Tamriel, most Wood Elves probably would not practice it still, because of the way the others races would judge and berate them.
The first Pocket Guide that refers to it was written in the 2nd Era, but relatively towards the end. I think the only way to truly know if this practice is still going strong in Valenwood would to have the next TES game set in the nation.
For in-game RP purposes, you could always make a Wood Elf that's not very religious, lol.