PHOTO (Duke Athletics): D.J. Steward scores against Boston College in the first round of the ACC tournament in Greensboro. By TOM SHANAHAN The consequences of college basketball Blue Bloods Duke and Michigan State struggling this season includes more than a lack of wins or having their NCAA tournament streaks threatened. They haven’t enjoyed their usual blowout victories. That lack of opportunities has prevented Duke coach Mike Krzyzewski and Michigan State coach Tom Izzo from emptying their benches. Coaches…