Sounds like a good idea to me. Although, the title immediately brings to mind "12 Angry Men", which I fear would draw criticism from Shyamalan-haters who would blindly claim he is "ripping off" of that movie.
The interesting thing about these Nigh Chronicles movies is that they sound like great ideas, but I have a real hard time trying to figure out how they can stretch the idea into a full length movie. I'm not doubting by any means, I'm just curious.