Elisée Maurer has made "a game to make games". If you think Minecraft is a platform for game creation, just wait until you see Maurer's Craft Studio:
It take inspiration from Minecraft of course, but it's also reminiscent of Little Big Planet, letting you build things, but also design the principles of your world. As Maurer says, "you can rewrite all the rules." It's basically an easy to use creation tool that utilizes social interaction to make game creation experience user friendly and fun. With Minecraft, LBP, and games like Craft Studio, the contsruction of games is becoming less of a slog more and more enjoyable in and of itself. It will be interesting to see the products that come out of this new paradigm.