David Platt touches on something here that often remains beyond our purview, but is critical to our task. For fascination with ourselves, we can miss the bigger picture of the growth of the gospel across the globe. As the Germans would say, "We have tomatoes on our eyes."
By 2025 the most Christian continent on the face of this earth will be Africa. Latin America will be second. These areas are currently undergoing astounding growth in Christianity, and are major players in getting the gospel to heard to reach places (including within our own borders).
That's why we are investing heavily in deeply, biblically training called workers. With every person who complete the Didache Institute, that's one more theologically sound, well-equipped laborer for the field.