In years to come we will look down on the 5 day working week in the same way we currently do with 15hr factory shifts during the industrial revolution.
It absolutely blows my mind that 99% of office roles are still 5 days / week, Monday to Friday - why is there basically no variation on this model? I'd be more than happy to work a job for 80% salary for 4 days per week...
So much so, I'm about to launch a website listing remote software jobs with a 4 day work week: