As Michael already pointed out: it's very,
very difficult to assess how much really has been lost. While in most societies worldwide a considerable part of the population has lost intimate knowledge of the "old ways" this doesn't mean that there are not some who still hold it dear and pass it on. However, if it gets down to core beliefs/knowledge/skills in Asia, you basically have to marry into the (right) family to have a ... chance of becoming privy to it - in just about any other constellation one can consider oneself lucky if being considered worthy for some of the stuff you're looking for. Exaggerated? Not that much...
Regards,
Kai