1) worker productivity (does it go up or down for all of these professions)
2) do companies want to pay you as much if you work from home?
3) is it sustainable for large swathes of people vs. small groups of people who self-select to like this work-style
4) will people abuse the system such that it ruins it for everybody else
I can see a far more likely implementation of this would be a mixed case -- "work from home wednesdays" or something like that.. not friday or monday because then basically people would assume there is a certain amount of abuse of people working for 1 hour on Friday then starting their weekend early..