I use the Bradbury story name somewhat tongue in cheek, but this article is tantalizing (as in: I want to read more). I worry daily about the balance of play (and exploration) in my kids lives. I use a picture from a Star Trek episode a little less tongue in cheek.
The current dilemma I find is that there is SO little in their school lives (though they both go to what I would consider great schools) that free time needs to be scheduled — paradoxically.
I think it extends past the kids, though. We devalue play, active play, to our detriment.