What does directly touch church life are Pew’s numbers on generational change. Attachment to religion is declining across all age groups, but the rise of the nones is most pronounced among younger cohorts: the younger the age bracket, the less likely people are to belong to any Christian (or other religious) body. And of all Christian groups, mainline Protestants do the worst job at reaching and retaining younger generations.
One practical lesson of the Pew report, then, is on the crucial need for mainliners to focus on passing the faith on to the next generation. Mainliners may need to borrow some of the ethos of evangelical Protestants (who seem to do a better job at this) in equipping families to be primary incubators of faith and in forming identities that are distinct and (in some selective ways) more oppositional toward the culture than they have been.