Al Mohler points to a good essay by Diana West, regarding the change in roles between children and adults.  

Here is West's introduction:

When your average doting adult today murmurs the expression, “Out of the mouths of babes,” it is less an expression of wonder than a validation of the widely held assumption that children — babes, tweens, and teens — are innately wiser than their elders. They know better (sexual and fashion choices). They are discerning (music). They feel, therefore they understand (politics). Or so we have come to think due to a stunning if under-appreciated cultural reversal. Once upon a time, we believed wisdom was an expression of experience and maturity. Today, we believe the exact opposite.

Mohler concludes:

From a Christian perspective, Diana West's essay, as well as her book, The Death of the Grown-Up: How America's Arrested Development is Bringing Down Western Civilization, serves to alert parents and others to the challenge of raising children in such a culture. The goal of Christian parents must be to raise children to adulthood — a genuine adulthood. The Bible honors children, but the biblical worldview establishes parents as the authority figures and adults as the figures of wisdom.

"Seen but not heard" is not the best model for parenting children. On the other hand, it is infinitely superior to the abdication of adult authority that marks the current age. Once again, Christian parents are reminded that raising godly children in this age requires the courage of a counter-revolutionary.