What could make the Gospel-centered movement unravel

What could make the Gospel-Centered Movement amount the younger generation unravel 

[youtube http://www.youtube.com/watch?v=NY6bn-MrjdQ?wmode=transparent]

Seen on the Gospel Coalition Blog

http://thegospelcoalition.org/blogs/justintaylor/2010/11/09/piper-on-what-cou...