This reminds me of a TV show featuring the late Jacques Cousteau. He regretted the fact that some of the natives of the Aleutian Islands were no longer using canoes, but boats with outboard engines. He said that part of that culture died, because people no longer knew how to build canoes and use them. Agreed. The one question that I asked myself at the time, and one that Cousteau never asked, was what the Aleutians thought about replacing canoes with boats. They obviously felt fishing was a lot easier.
Mexican author Rosario Castellanos wrote a book called "Balún Canán", which means "Nine Stars" in one of the indigenous languages. In that book, her Indian characters fight for their right to learn Spanish. The masters used to forbid them to speak "Castille" because that way the Indians had to remain ignorant, and therefore would never be able to overcome their exploitation. These people fought for their right to speak Spanish. Were they wrong?
Some people here have said that original cultures fight to stay alive. I would qualify that. It is people who fight to stay alive and be their own selves. If they should want to abandon some customs, why should anyone tell them otherwise?
English is a foreign language to me. I'm the result of many mixtures, and, therefore, am not a member of any "original" people. My culture is Spanish. No one in the Spanish world can claim to be anything but mixed blood. Should I not have learned English, which has made me someone else? English has put me in touch with ideas and people that are certainly not those of my own culture. I feel I have learned a lot; I feel I have been empowered and, to an extent, liberated. Is that wrong? Why would anyone want something different for the Mashco Piro? While no one should tell them how they should live, and no one should claim ownership over their own land, I have a problem with keeping them isolated and "pure" against their will.