There's a chapter in the book, Perspectives on the World Christian Movement entitled, "The Two Structures of God's Redemptive Mission." In it Ralph Winter makes the Biblical and historical case for the importance of fraternal church associations. He refers to the church as the modality structure and these associations as the sodality structures God uses to accomplish His redemptive purposes.
There's no doubt that what we call network and missional non-profits have been part of God's plan since the book of Acts. This doesn't take away from the church. It actually adds to it. It extends and empowers it. That's why I love that our software is being used by so many of these organizations.