Yeah, cheesemakers, smokers, curers, preservers, fermenters of all stripes, as temperatures increase, energy output declines, and energy demands increase, we'll be having to find new ways to preserve local food products for consumption other than by refrigeration.

Oddly, I believe this is probably most correct. Depends how far, but a collision with a celestial object or a big volcano could and will eventually end a lot of progress.

Like.. Imagine Yellowstone blowing. Whoever survives the winter is gonna be the ones who knap.