Projecting Cultures Forward
So I'm working on a setting that involves colonization of a world by a wide variety of groups. In part because of the influence of Unnight, as one of the inspirations of the setting, the colonists come to a disproportionate degree from endangered ethnic groups. Contact is lost and a variety of unfun events happen to help knock people down in TL and reduce their transmission of knowledge of the past.
What I'm looking for specifically is advice, tips and tricks regarding taking a culture and projecting it forward especially in a low-tech context. What general scale of time are we looking at before a culture only retains the most general similarities to it's past? What modern beliefs will be maintained to "anachronistic" levels for low-tech societies? What's the mean time to happen of significant relgious schisms? That sort of thing.
This is for GURPS, but it's not terribly connected to actual mechanics thus Roleplaying in General.
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