Oh, they surely can. But that gives those cultures a disadvantage and maintaining this disadvantage "indefinitely" seems to be a stretch, especially given how cultures are malleable and tend to change anyway.
Indefinitely meant more "comparably to a culture lifespan" than "until the heat death of the universe".
This is the monthly thread for posting media of various types that you've found that you enjoy. Post what you're reading, listening to, watching, and your opinion of it. Post recommendations to blogs. Post whatever media you feel like discussing! To see previous recommendations, check out the older threads.
Rules: