I hope the optimistic posts in this thread come with a bunch of knocking on wood.
We haven't had a late start to the season in a while. Killington has managed to pull off the World Cup every year. I say we've been getting kinda lucky.
Pessimistically, I say Gore & Whiteface have to push the opening back to December 7-8, we have a couple of cold weeks, then we get a brutal warmup in early January that forces a bunch of mountains to close. Then we limp through a cold, but relatively snowless, February before March finally delivers some snow (after everyone has quit on the season).
Just a guess, based on "balance". By having a pessimistic attitude, I will set myself up to be happily surprised and I'll make sure to fully embrace every good day that we get (especially early season).