Absolutely. Even as I've turned baseballing into a real job, my emotional connections - both good and bad - with teams has waned. I used to be a rabid hater of specific teams - Cardinals, White Sox, Yankees, Dodgers - now I'm just kinda meh about most of them. Still mostly dislike the Cardinals because they're just so bloody arrogant.
I imagine people in the dugout feel this way even more strongly.