There is absolutely, positively, 100% no way for anyone to know. Nada. Zilch. People can guess, but nobody knows.
The "eight week rule" is an AVERAGE. No one can say "the route from Atlanta to San Diego (pick any two cities) will be cheapest 8 weeks out". I've gotten plane tickets ~310 days out, and tracked them, and they never got lower than what I purchased. I've gotten plane tickets to Europe for 1/2 what they were normally going for during an unpublished 2 day sale.
As soon as I know when and where I'm going, I'll start watching airfare. I'll use google flights as well as check on my own periodically. I'll be able to judge when I see a "jump on it now" price. The fact that you're seeing the same pricing 8 weeks from now vs the beginning of December really means nothing. Prices can go up, they can go down, they can stay the same.
Personally if I'm planning a trip, there is no way I could wait until 8 weeks out unless driving was an option.