I don't think the two scenarios are remotely comparable. Unlike Dantonio, Hoke has a well demonstrated pattern of poor game management and scratch your head decision making. This has translated to very bad results on the field. That alone makes him very fireable. Prior to getting hit in the head, Morris had no business in the game any more. He'd committed numerous turnovers and had lost his mobility in that his left leg was about useless. It was already insane to have him in there from a game management standpoint when Gardner was healthy and sitting on the sidelines. Morris staying in the game was a high risk, zero reward scenario at this point. The best possible outcome in this scenario would be for him to not injure his leg any worse than he already had. Take the kid out and begin the healing process. It's garbage time anyway. I just don't see the case for keeping him in. Then, the hit happens.
Gholston was clearly knocked out, and probsbly shouldn't have played. But I'm not a doctor. I am concerned about the decision to play him, but there is a possibility that he was evaluated properly and given an adequate clearance. I wasn't there. I also don't know if Morris was concussed or not and I don't think it is the heart of the matter except in principle. Once he was blasted, and had difficulty standing, just what the hell is the reason to keep a healthy QB on the sidelines while a clearly failing and rapidly deteriorating situation is taking place on the field? Put in Gardner, find a helmet that fits your third stringers head, and take Morris to the locker room and ask him some questions. And if you can't find a helmet for your third stringer, perhaps consider using a time out.
Dantonio's competence as a coach is not being questioned. Hoke's already done numerous things to invite questioning about his. That series was just a perfect storm of everything that is wrong with a once proud program.
But sure, dig in your heels and plant a flag in Hoke's camp. He just needs more time and it will come together.