There is a poll out here, which I found reading this site. Below is an excerpt from that commentary.

The church failed to spiritually feed 71 percent of those who became Protestants. This was the second leading reason for Protestants – 51 percent of them said the church had failed them on a spiritual level.

This should be a wake-up call for all churches – Catholic or Protestant, Evangelical or Mainline. For some reason, the church is failing to capture the imagination of its flock. Overall, the church is failing in important ways to build a sustainable and thriving community that will attract, feed, nurture, and hold people throughout their lifetime. Instead, church is becoming stale, uninviting and boring. It no longer provides spiritual sustenance or holds any deep meaning for its congregations. Instead of building excitement and a commitment to social justice, the Good News is producing yawns – and not just from those who haunt the back rows, but those who otherwise would be committed to the church and its mission. That has led to the largest group being those who are unaffiliated with any religion.

This little tidbit insinuates that churches once upon a time were able to "build a sustainable and thriving community." This doesn't necessarily hold true. I'm only speaking from experience, but the statement that "church is becoming stale, uninviting and boring", is false in the sense that those descriptors have always applied. Things aren't changing at all, what's changing is the taboo against talking about it, acknowledging that one feels this way.