I'm surprised this thinking isn't more prevalent. When I have lots of free time at work with few interesting problems I know it's time to find a new job.
I agree with the guy in that I'd like to have more time with my family, but I can't imagine effectively not working and growing at all. He seems in the ideal position to search for a dream job. What he has is not a dream job.
Well, if he's not making any progress career-wise it's a dead-end job. Personally, I'd love to scale back to like 20 hours a week and spend more time with family, but in those 20 hours I'm working I'd want to keep growing. Chances are that the job he has will end before retirement. I would want to be prepared for that eventuality.
I agree with the guy in that I'd like to have more time with my family, but I can't imagine effectively not working and growing at all. He seems in the ideal position to search for a dream job. What he has is not a dream job.