The video of our Advance09 panel is up. Take a look.
Interestingly, John Piper's first answer led to this clarification. The clarification is well worth your read just to get a take on how we might view modern culture.
Also, several people have asked me about my comments about missions cooperation being the doorway to theological compromise. (I think that surprised some people.)
However, there is little question that this is an historic pattern. I wrote a bit about it a few years ago here. My answer in the video gives more details.