Willow Creek is all over rethinking church in their REVEAL Study.
The bottom line: the seekers and "baby christians" love church...but the problem is the "centered" and "fully discipled believers" feel unfulfilled and stagnant, possibly because the church hasn't taught them well enough how to grow the other 6 days a week outside of Sunday when they are "on there own." That is the individuals responsibility.
It's fascinating stuff for anyone in ministry in any capacity or anyone who just loves Jesus.
Learn more about it and watch it at this link AND at this link.