How sad it will be if in three or four centuries all that is spoken in the world is English, Hindi, Mandarin, Russian, Japanese and a handful of European languages, ... We will also lose much healing knowledge and much conservation knowledge embedded in indigenous cultures.
I am not an advocate of restricting choices of indigenous people, and so I think it inevitable that all indigenous peoples will eventually encounter Western technology and western ways,
Clearly, it is in the interests of Western societies to help protect indigenous cultures,