Did not say anything about proposing WHO would determine IF the injury is legit. As Rey said, they screwed it up for everyone. All I know is that IF a player is hurt during a possible game winning or game tying 2 minute drill...they are going to get penalized twice. Losing a player for the next play AND losing a timeout.
Tweaking the rule is something that had to be done because of a few that tried to take advantage. Like the Stabler Rule, for example...