So epic, it is inevitable that they will come into contact with the outside world eventually, it is just so amazing that they are still living like that.
It does make so much sense though, the land they are living on provide very little means for technological expansion. They have most likely been harvesting the same crops, and relying on the same food sources ever since they started.
I wish I could remember the movie that was done about this, it explained why we have third world countries and why some areas, Eurasia for example, have becoming booming economic powerhouses.
When I can remember the name I will be posting it here because it is, quite possibly, the MOST intelligent movie ever made.