Richard J. Krejcir has written some challenging articles on why churches fail (part 1 and part 2) and succeed. I find these articles encouraging because Krejcir looks at statistics, but doesn't fall for business-driven marketing solutions. Quite the opposite: he roundly criticises the current trend of running a church like a business. Instead, he challenges church leaders to model Christ-likeness, apply the Bible to people's lives, and unequivocally challenge the congregation to be Christ-like and display the fruits of the Spirit.
Our churches fail when we fail to know and grow in Christ, when we fail to follow Him and Him alone! It is His Church; we are the stewards of it. We must act like it. All we do is for His glory, not ours, or even for the people in our neighborhoods!