First of all, lots of blame to go around:
1) The refs have a responsibility to take an injured kid out at least a play, especially on head shots. This is especially true now with the concussion awareness going around the country. I never saw the umpire or the head ref check on the QB after the malicious hit and him stumbling around.
2) There is no way that any member of the medical staff did a complete concussion check in that short amount of time. They needed to sit him down, ask him lots of questions (like say these numbers backwards 1, 2, 5, 9, who are you playing, where are you?, then do the eye check, see if he has headache, and finally motor tests).
3) I've never seen an entire sideline so unprepared.