Yes, the world is becoming more globalized. Diaspora (refugees, migrants, students, business people, tourists, etc) are in lots of places. The UN estimates there are over 250 million migrants in the world. BUT: most of the world's non-Christians are still found outside the West. (And the unevangelized are by definition non-Christians, so most of the unevangelized/unreached will be where the non-Christians are.)
Over 2 billion--nearly 3 billion--non-Christians are found in India and China alone. These regions are estimated at half-or-more unreached/unevangelized. This is where the bulk of the remaining task is found.
That's why I still focus on North Africa / West Africa / Asia.