Peg Tyre of Newsweek thinks she may have part of the answer.

Instead of unstructured free play, parents now schedule their kids’ time from dawn till dusk (and sometimes beyond.) By age 4, an ever-increasing number of children are enrolled in preschool. There, instead of learning to get along with other kids, hold a crayon and play Duck, Duck, Goose, children barely out of diapers are asked to fill out work sheets, learn computation or study Mandarin. The drumbeat for early academics gets even louder when they enter “real” school. Veteran teachers will tell you that first graders are now routinely expected to master a curriculum that, only 15 years ago, would have been considered appropriate for second, even third graders. The way we teach children has changed, too. In many communities, elementary schools have become test-prep factories—where standardized testing begins in kindergarten and “teaching to the test” is considered a virtue. At the same time, recess is being pushed aside in order to provide extra time for reading and math drills. So is history and opportunities for hands-on activities—like science labs and art. Active play is increasingly frowned on—some schools have even banned recess and tag. In the wake of school shootings like the tragedy at Virginia Tech, kids who stretch out a pointer finger, bend their thumb and shout “pow!” are regarded with suspicion and not a little fear.

Homeschooling is a blessing in this area. You can do all the activities and still not have their day scheduled from dawn till dusk. Or you can opt out of lots of activities and only pick one or two.