He just would have been released after not performing for a while. Corey Koskie of the Twins had his career end as the result of a concussion and continuing effects. That was several years ago. It is not that concussions were completely ignored in the old days. Concussions are fairly rare in baseball as compared to most other sports. Plus, the home plate collision has been legislated out of the game and so has the second base collision. Is there really a need for a mandated concussion protocol in baseball? If a guy gets his bell rung in the playoffs but feels fine the next day, he has to sit out 7 days? The player has no say?.