It was nearly seven years ago I wrote up some thoughts about Hawkeye, the super-accurate camera tracking system that allows line calls in tennis to be queried and corrected. At the time, I spoke of its benefits and pondered whether we would ever get to a stage where there are no linesmen at all, instead umpires would rely on Hawkeye to make all the decisions. This hasn’t happened, but more and more I’m starting to think it should.