It's an interesting study - but tennis is fundamentally a very bad model for understanding the impact of technology on the employment market. A better tennis pl

It's an interesting study - but tennis is fundamentally a very bad model for understanding the impact of technology on the employment market. A better tennis player does not produce more 'tennis' than a bad player. So, no matter how the technology changes, the number of tennis players required is unaffected. Technological change in the workplace almost always refers to technology that makes a worker more productive. Since the demand for most things is constant, this means you need less workers for a given product. So, the problem would not be old workers being worse at their jobs - the problem would be that, absent external factors, there would be less jobs around.