Gold Dragon, maybe your'e right...maybe the PD movement shouldn't be characterized as pragmatism. But consider this: How many fundamental, Bible-believing churches do you know of that condone casual dress in worship, subjective pop-music type singing from the praise teams, very anthropecentric topical preaching from the pulpit, no public invitations, etc.?
Don't get me wrong - I'm definitely not saying that all PD churches have adopted this sort of model. Yet what I am saying is that you simply won't consistently find these types of things in those churches that allow the precepts of God's Word to the determine the means by which they seek to fulfill the Great Commission.
GD, you also raised the question about pragmatism. My question to you would be what good can come out of a pragmatic approach to church growth? Why is it necessary for the Body of Christ to adopt pragmatic modes of operation in order to reach the world for Christ? You might respond by saying that such is the example we find in Scripture and quote 1 Cor. 9:22: "I have become all things to all men that by all means I might save some." I'm not suggesting that we stop being students of our culture, or that the church stop attempting to meet the culture at the point of their need. Rather, what I am suggesting is that pragmatic thinking has gone to an unhealthy extreme in many local churches. I know the subject of this thread is Rick Warren, but the perfect example of a "church" where pragmatism has won the day would be Lakewood Church in Houston. I've listened to many of Osteen's sermons, and what I've found consistently is a complete absence of preaching on such biblical themes as repentance, atonement, the holiness of God, exclusive salvation in Christ, etc. Because pragmatism has become the rule of the day, Osteen's messages are really nothing more than hashed-over power of positive thinking sermons in the order of Norman Vincent Peale and Robert Schuller. Worship is very much a production. The lighting is all very strategic placed - so much of what happens during worship is all about aesthetics. This is what happens when pragmatism becomes more important that fidelity to God's Word.
Sometimes I ask myself (with a bit of sarcasm) "How did the early church ever reach thousands upon thousands of lost people without the use of anthropecentric preaching, praise teams, casual dress, and the like?" Could it be that they were more interested in seeking first the Kingdom and His righteousness than they were with becoming palatable to the culture around them? Just some food for thought.