You are probably right that a cancelled Nebraska game does not impact the SEC. But I do think that the media outrage machine will question the wisdom which will put pressure on those conferences. There will be serious talk about what is college football really attempting to accomplish here.
I will argue that your injury tracker is not about hospitalizations; those are typically orthopedic injuries and do not have ICU status. But then, hey, let's play; covid is something we have to live with; those schools that cancelled their seasons over a silly little virus that is nothing more than the common cold were foolish. No need to cancel anything. A student-athlete who gets it, hey, its no different than a sprained ankle.
This is my new mantra: I will be following your logic that if a student-athlete of any age who gets it and then goes to the ICU and is on a ventilator or gets a vascular or cardiac-related situation that prevents them from playing, well, hey, that's just the risk they have to take. And if they die, no big deal, student-athletes die on occasion.