Megachurch Number Crunching - What does it prove?

From Suburban Messiah:

Martin Marty, a longstanding noted Christian scholar (in fact, I read one of his books breaking down the use of mass media in Christianity — from 1961), recently wrote an article regarding the numbers game in modern American Evangelicalism.

Questioning a topic I pondered about a month ago, Marty explains that numbers don't really tell the story of what a church is doing and how it's affecting its congregation, no matter how many people are attending.

I don't think this is surprising, but as is mentioned in his article and in mine, Willow Creek, one of the most influential megachurches in recent history, has begun to question its mission. Seeing that numbers were the focus instead of ministry, the church decided to take a different angle. With the recent surge of corruption in the Evangelical ranks, I wonder if others will follow Willow Creek's model like they did originally.