However, you refer to a 4-hour work week. That's not a lot of time. Assuming that I'll still make at least $300 dollars per week, then yes. Any less, probably not. I still have to eat.
As for a 4-hour work week, there's a sense in which a work week that is too short will bore you to death. I would take a pay cut in exchange for, say, 30 or 20 hour work week, but 4 hours a week seems extreme. Plus, if you are doing something you enjoy, "work week" doesnt have the same meaning as a traditional 9-5 job.
Surely certain tasks can be optimized better through automation, processes, technology, etc. It's almost like tell me to work for minimum wage.