I guess then we go back to the basics. The only constant is change.

Gowdy, J., 2020

https://www.sciencedirect.com/science/article/pii/S001632871...

There was constant change in the palaeolithic, change of the form "which tribe controls which valley" and no further. The range of possible changes is gonna shrink back to that small range without a stable climate and/or a solid tech foundation.