John Hunter: Teaching with the World Peace Game

Let me start this post by saying that Gamification is not a new idea it is simply a new term. As any teacher will tell you they use some sort of game to teach concepts or make learning more fun for students. John Hunter's TED Talk shows the successful use of and evolution of his World Peace Game.
Students today participate in online games like World of Warcraft, Minecraft, and Grepolis, which require critical thinking skills, collaboration, and problem solving. So, why are we still using static textbooks and worksheets to teach concepts like economics, geopolitics, history, etc.?