If the history of the world since the Industrial Revolution can teach anything, it is that while the machines took much of the work, they did not shorten the workday. Instead, we all just work more. Since the Information Revolution, some people get off work, go home, and continue to work. It never stops. The companies of the world will never tolerate giving people more time off. Why do that when people could just get more done in fewer total days?

Personally, in the times I've had the most time off, I find that I am more productive, but that doesn't matter to any employer.