Should all employers adopt a four-day workweek?

Why not 1 day a week? Are you ok to take a 20% cut in pay if its reduced from 5 to 4? 
There is way too much emphasis on employee welfare. Employment is a choice!

Need a 3rd option. "It depends". It is certainly not for every business and company. For those businesses that do have flexible working arrangements then it should be heavily considered

There are so many industries or facilities where a four-day week seems not applicable. Nevertheless I think alternative working time models it should be considered much more among all employers.

We must be thinking about how we get to a George Jetson work week.