From a secular point of view, I disagree with Sundays being the only day in which you can have a day off, on the basis that some religions believe different days are rest days (eg. Seventh Day Adventists believe saturdays).
I also think that everyone should have one day a week where they know they aren't working, so maybe companies can now re-jig it and have different people having different days off.. also meaning they will probably have to employ more staff, so thats more unemployment reduction.
Now after writing all that, believe it or not.. I actually quite like this change tbh