I get what you are saying. Things happen. But UCF claims to have had zero in 2017. Until Harrison Phillips blew his knee out at Stanford their S&C team had not had a season ending injury in 4 years. I would lean to thinking like you, where injuries happen. We just have to eliminate the season ending ones. Kids are gonna get knicked up.
As you have said yourself, many of those season ending injuries were knees and that is going to happen in football. I do think more physical practices will lead to some increase in players missing a game or two, but hopefully that is off set by development of many more players and having quality depth.
I have no explanation of how Stanford can not have a single season ending injury in 4 years....although i'd love to hear how differently they do things than other schools. Not sure any other school to say they went one year without that type of thing happening.