"Personally, I think if the commandant can make a compelling case for a change, I'm willing to give him a shot with it."
I'd venture to say the majority agree with this. The problem is, he hasn't made a compelling case, nor has he given any indication he will try to. All we have are vague statements about fish not meeting standards with no indication as to what exactly they are deficient in or how his plan is tailored to address those deficiencies. Nor has he given any other reason to trust the process used to develop his plan.
For better or worse, the Corps is not the military or an academy and it can't be like them even if we all wanted it to be. It is voluntary. Cadets can choose to leave any time. That makes certain leadership approaches ineffective. When you lead volunteers, you can't just say, "Do it this way or else!" You have to do the hard work of winning hearts and minds through trust. It seems that every one of these commandant generals initially fail at this.