We don't have 1 day a week workweeks not because it isn't possible but because we don't live late 19th / early 20th century lifestyles anymore. We have modern cities, infrastructure, transportation, manufacturing, power generation, diets, and recreation. I don't think many would want to go back to an agrarian lifestyle where you live in a one or two room brick cottage, walk everywhere, till a field with a very simple, small tractor, eat only what you grow seasonally, have two changes of clothes, and own basically nothing but the bare essentials to clean and feed yourself. If you did that then sure you could share the work between a little commune and maybe get by on a rotation of duties if you had enough up front capital to buy all the labor saving devices and could manage to keep everyone happy enough to share it all equally but I have a feeling it would still wind up being a hard life of poverty. There's also the question of how you keep all of the manufacturing and professional services going with so little demand for their outputs. There are very good reasons why the vast majority of the populace used to be stuck in subsistence farming for life and why that only changed with the advent of mass production and market economies.