I just read the article on the sidebar about David Brandt. In the interview, he was asked if he keeps up with Michigan football. He said sometimes Michigan football clashes with his hunting schedule, so he catches up with the highlights. He watches the big games, though.
This is not the first time I've heard sentiments like this. I don't know how you could pour your heart and soul into a program like that and then have it become an afterthought. Maybe you just get burned out. Or maybe after you've played for so long, your loyalties get spread out so much (between your old high school, your college, your pro teams, etc.) that it's hard to remain emotionally attached to one program.
When I graduated high school, I went back for every high school game I could. I started coaching there as soon as I could after college. And even though I had to move away, the first thing I do on Saturday mornings now is check the internet for their score.