If you’re a college sports Pollyanna who pounces every time a college coach leaves an ideal situation, shaking your finger at all who surmise the coach is leaving because of what’s going on in college sports, stand down on Dusty May.That’s absolutely the case here. The Athletic’s CJ Moore has covered May as closely as anyone over the past several years, walking with him from Lucas Oil Stadium to the team hotel after each day of Michigan’s national title-winning week, so take it from Moore: It’s all too much, even for a guy who seems to have it all.It’s all too much, that is, when weighed against the possibility of coaching Cooper Flagg and a Dallas Mavericks franchise that has two first-round picks in a mega-loaded NBA Draft on Tuesday. It’s not like May is leaving to start a pizza franchise or see if he can make it on “The Voice” (might be a bit raspy for that).Still, when you’ve done what he’s done in a flash at Michigan, and you have a top-five team coming back with a real shot at repeating — which would make him the 18th coach in the history of the sport with multiple titles and the ninth to go back to back — and you leave that? You are lending factual evidence to the (oft-dramatic) testimonials about the unsustainability of this college athletics era.And if you do well, you might inspire a brain drain.Dusty May leaving for pros is familiar for Michigan fansAustin MeekThe NBA has largely laid off college coaches in recent years. Over decades, they have mostly failed in the association. If Rick Pitino can’t get it done, who can? John Beilein, a magnificent teacher and tactician who was lured from Michigan by the Cleveland Cavaliers seven years ago, flamed out in months.