Apparently they've lived there for about 50,000 years. So, any day now, eh?
Well you and I both know I didn't say "any day now".

I don't hold them to any feelings of false grandeur here. They are a hopelessly inbred group of people (unless they've been kidnapping inhabitants of other islanders, but there's no such reports), who have chosen strong isolation. The only reason why they continue to exist in modernity is due to A. Not having anything of value to foreign countries and B. due to the benevolence of a modern country (India).
Aside from getting a long run on the inbreeding thing, you and I both know that more has happened to humanity in the last 500 years (and even moreso the last 120 years) than the last 50,000. These guys get a cookie for surviving as long as all the other major groups of humans.