Brazil has confirmed that another (the 15th) uncontacted Indian tribe has recently been discovered living in the Amazon near the border of Brazil and Peru. It consists of approximatlely 200 members who live in four thatch roofed buildings and grow corn, bananas and peanuts. This brings the total known uncontacted Amazon Indians to about 2,000. The Brazil National Indian Foundation estimates that there are as many as 68 uncontacted Indian tribes living in the Amazon.
I wonder this too. My scientist side tends to think all knowledge is good, and that it would be wrong to not let them in on the news that a big world exists beyond theirs. But then I envision potential disaster.
In reality, I suspect the church will figure out a way to get to them. The power of the zombie jesus will compel them.