Meh, really we need society to change, massively, worldwide and it won't happen.
Half the jobs, more than half the jobs that are done, are simply not required whatsoever. We generate needless work to be done, to occupy most peoples times. Its nuts, we mostly live to work, and when its done have very little time for other things.
Imagine how much work there would be if, we only had a couple brands of cereal and pasta, and they weren't competing with loads of other brands. One company making all the biscuits.
Thing is, in a perfect society, a "star trek" esque future, people would share the workload of those jobs that are REQUIRED, building homes, maintaining heating, power and so on. Other industries would be massively simplified with the goal to make the most money removed, as competition would be pointless, the best designers get together and make the best tv's, chairs, sofa's, etc, etc and people get what they need.
Everyone puts in a short shift every day, job sharing most jobs and have the rest of our time free to enjoy and live.
Unfortunately in reality you see what happens with people with idle hands, boredom is what leads so many less nice people into trouble.
When you really think about how many jobs exist purely because of the money involved. The NHS employs 10k's of paper pushers simply to balance the books and send out bills, receive payments, every company has people doing that. If you abolished money, you'd wipe out a quite insane amount of jobs, with only actual manufacturing jobs left over, which could be shared easily over more people and everything that gets built/made/run now and all public services could be run without people working silly hours.
In a society based on amassing wealth, and material things, a reduction in the working week is a stupid idea as people aren't willing to share jobs and make less money.
Whats insane is the level the population is growing at, with the increase in efficiency of everything else, we're already running into trouble with unemployment and losing jobs everywhere.
50 years ago you had less people who needed less jobs, and things like, say farming, would taken dozens of people to run a huge farm to make food for say, lets call it 5000 people a year. Now we have far more people who require jobs as the population increases, and that same farm now only requires 5 people working machines and hydroponic warehouses, to make food for 20,000 people a year.
Its the same in most industries, less jobs with a growing population is always going to lead to huge trouble down the road.