Might be talking about a couple different things here. There are more less-violent sports competing for the best athletes, and there are more good college football programs competing for the best football players. Concussion protocols are temporarily sidelining players who normally would have played through, but that doesn't feel like a Blue Chip problem. I mean, the teams that are failing miserably are losing to teams that do better with the same limitations. WRs have always tended to be primadonnas, but weirdly enough I think QBs are tougher than ever. Defenses are still loaded with badasses.
But I get what you're saying about depth. That seems to be injuries in general. I've heard the theory that today's athletes have gotten bigger, faster and stronger through advancements in training and dietary supplements, but things like joints, ligaments and bones aren't coming along for the ride. The bigger, more muscular athletes of today are breaking down easier. You see it in the NFL, NBA and MLB, too.