I think many evangelicals have a very simplistic view of what it is that God is calling us to do. There seems to be this invincible ignorance in the body of Christ today that size means correctness, or size relates to orthodoxy, or size means that God's hand is blessing the church. And nothing could be further from the truth. Size does not determine orthodoxy. And size is not a measure of success, either.
Biblical fidelity is the measure of success.
Now, there are cases in the Book of Acts, as you well know, where the church grew dramatically. Preach on the fear of God. I mean, no way, they'd tell you. Go out and find out what their perceived needs are and meet those needs. Truth is always the casualty when technique becomes supreme.