Defenses are forcing him to stay in the pocket because they know he cant beat them from there. When you never throw to wrs it makes game planning for the defense pretty easy
Or maybe opposing coaches realized all u have to do is stop mccoy, keep tyrod in the pocket and hes pretty much useless unless the defense gets 3 or 4 turnovers to bail him out
What about boxing, mma, hockey. All invovle head injuries, all still around. There will always be people willing to play. There are alot of dangerous jobs around the world and people still do them