Changing the length of the week like that is too arbitrary. The way it's set up now isn't. If these changes were to occur, it would unnecessarily disrupt our track of time, and would lengthen the time people spend in school, make many lose their age-associated privileges (which, by the way, when doing that how do you answer questions surrounding age anymore?),and it might cause people to get paid less if I'm thinking correctly. If everyone still works 40hr work weeks, businesses would have to hire more people in order to cover the extra three days. And small business owners who with the 7-day work week as it is work themselves to the bone all day every day may not be catching a break - unless they can/choose to work every day but have shorter operating hours... Eh I'll stop here. Point is, it sounds great in terms of having more rest time, however in terms of practicality it sounds like the kind of idea that'd fall on its face.