An acknowledgement that real Christian faith is an experience of the whole person, and is to be expressed and communicated to others. There was a lot of unique promise in Hammond's description. Noone was quite living up to all of them, but most were trying hard. Mainline renewal was still too young and fragile to be a full-throated voice of its own.
Mainline renewal is no baby anymore.
I can't be very sanguine about what has happened over the years. Mainline renewal has had its impact, for sure. Some, such as PUBC, had to die because of it, so that its purpose could live in a more vibrant group. Others are finding themselves so pushed to the margin that they take extreme actions, which generally make things worse. Others are in churches where simply speaking up about Scripture will create unbearable friction.