Many more stitches are needed to sew up head cuts on this basis than knockouts from shoulder charges. A well-executed shoulder charge tackle is a "bell-ringer" (which does not necessarily involve the head) and should be refereed accordingly.
The shoulder should be a legitimate target but not the head and it seems to me sensible for referees to stop the game to act on any suspect tackles aimed at the head. Doesn't league do this now?
If league goes too far in this area, my bet is that we will see offensive running aimed at defenders' heads and we'll have to go further in diluting what is regarded as the world's toughest (and most exciting) football code. You've only got to look how American gridiron has developed with helmets being used as weapons. Before the league administrators (re)act, they should ask why gridiron has an increasing problem with concussion and what protections there are from attacks with and from helmets.
It is often said rugby union is a contact sport - rugby league a collision sport. There is a difference. My game was at a modest level of league. I estimate I suffered eight or nine concussions during my playing days, more through a targeted shoulder charge.
I accept that it is likely that those sporting days and the consequential head trauma may well have contributed to the fact that I now have Parkinson's disease. But not one incident was from a deliberately foul or dangerous act.
I took the risk of playing a high-impact game but didn't regard that risk as any greater than many other sports and lay no blame on other players, administrators or referees.
I believe this issue deserves a lot more thought than what has been given it to date.