"You did explain that the value of a pack, is just the value of the cards inside- right?"

Yeah I took the current market price, or "last sold"

" ~1M packs will hit the market at the same time, significantly depressing the initial value of those cards, considering the print size of Untamed vs. the initial availability of Chaos Legion and the lowered Burn Values, right?"

Considering that the player base is more than 20x compared to the time when untamed was released I think we will see a gradual increase in price. It would suprise me alot if there was any price drop in the card value after release.