If you chop incomes in half, for example, Europe's various aging welfare states would quickly implode due to lack of tax revenue. Every advanced welfare state is built on tax revenue continuing to pour in. Many of the affluent nations in Europe are already struggling with demographics v tax revenue v welfare state needs, a rapid drop in income and it'd all go down quickly.
In any case, I bet lots of people would take less pay in exchange for almost twice as much time to spend with their friends and loved ones.