Putting students at the centre of the learning process and allowing them to learn through areas that they are passionate about is the most important thing.
Listening to the level of talk, discussion, conversation around Minecraft you would be silly not to allow students to explore their learning or have a chance to learn through this media. The skills that they use and explore are amazing from problem solving to collaboration, instinct to imagination.
Teach for tomorrow, learn for today. Lets the kids be the reason we get up and come to school each day.