Once in a blue moon, a brainstorming session produces an idea that is so blindingly good that people wonder not only “why aren’t we doing that already?” but even: “why isn’t everyone?” As someone who helps businesses conduct “war games” to inform their strategy-making, I suppose I see these moments more than most people; the whole point of these exercises is to devise new marketplace forays and anticipate competitive responses. But still, they are very rare.