It's the simplest mission model I've ever heard. If you're a Christian with a heart for making disciples among the unreached, keep your regular job and just change living situations. Move in to a poor unreached community. In big cities, there are whole apartment buildings in which the residents are over 90% from unreached ethnicities, and so likely have never heard the gospel. Then talk to your neighbors as you wait in the elevator, the laundry room, the lobby. Knock on their doors and offer them a pie. They'll probably invite you in and eagerly converse. No 4" orientation manual, no support raising, no creative visas, no traveling troubles. Just move in and prayerfully live life among the lost and hurting ... like Jesus did.
As we got in the car to head back to the conference building, one of the attendees, Eric, echoed my thoughts almost exactly: "It seems like that should be the default Christianity." I really hope that catches on--Christians being intentional about incarnational ministry among those within their reach.