We don't always have the opportunity to even do that.
And even when we do have the opportunity, there are cases where we can't, because the language is untranslatable, for example the North Sentinel islanders: https://en.wikipedia.org/wiki/Sentinelese_language
Yeah, you're right here. My point was more than it doesn't take biological successors to continue traditions. Was more meant to add a light of hope to an all around depressing situation.
If you look into traditional medicine in that area you realize that plenty of the plants they use and used never actually got a proper scientific research on them. It's basically getting lost in front of our eyes.
And even when we do have the opportunity, there are cases where we can't, because the language is untranslatable, for example the North Sentinel islanders: https://en.wikipedia.org/wiki/Sentinelese_language