I expect MD will retire this fall after the season, if for no other reason than his retirement level is set at the head coaches' level.
I recall when Mick was hired I checked his record and saw what he did to the program as HC at UM Western. After 2 years of worsening performance they had seen enough. For the next 30 years he does not get another head coaching job--either he or schools looking at him knew he was not head coaching material.
This hire was solely to bring calm to chaos, it was never a hire of who could best coach the team or produce wins. A panic hire to be sure, due to over blown hysteria by Missoula's local media. These athletes' championship aspirations were sold out by the administration's desire to take the heat of scrutiny off the school. That was accomplished but the players were sacrificed. What Griz fans became accustomed to was the teams playing better than their individual talent levels. The disenchantment of the last 3 years is that the Griz, as a rule, have not played to their potential. Exactly what happened at UM Western during MD's reign at the helm.
MD needs to retire, and he knows he needs to retire. Engstrom or Haslam will never fire him: they don't need to. I believe the decision to retire has already been made, including who will be elevated from this staff to take his place.