Sure way less traffic deaths but the spike in depression especially among males would be something very big. Life events are much outside of our control, having a 5000lbs thing that can get to 150mph if needed and responds exactly to the accelerator, brake and steering wheel input...well that makes people feel in control and very powerful while behind the aforementioned steering wheel.
Also productivity...I don't know...people think a whole lot and do a whole lot of self reflection while they are driving and when they arrive at destination they just implement the thoughts they had while driving. The ability to talk on the phone has been there for quite some time now too, so thinking and communicating can be done while driving already, what would FSD add?