After every bubble comes a bust, and if I had shares in the reality television boom that came to define TV in the Noughties, I’d be on the phone to my broker right now. 2010 won’t be the first Big Brother-free year since the last century, because first we have some celebrities debasing themselves in January, and a last bunch of wannabes having their three months of Heat magazine cover stories over the summer, but the world-dominating Endemol juggernaut has had the good grace to bow out after that.