I disagree with most of what you said. I don't see Minecraft as "for children" game. It was a game made for the full spectrum of the gaming community and its early success was as far as I'm aware primarily adults. The fact that children flock to this game as much as they do surprised me, but for what I hear from parents and teachers I would bet that a large majority of this very loyal following are still < 16 years old.
I have actually spoken with several people who were neither parents or teachers. What I concluded is that even among the game playing techies Minecraft is no where near as prevalent as is is among children. In addition to that parents and teachers also also talk to parents and most parents know little about Minecraft other than that it is a game their children play.
