Soccer is woefully behind in its handling of head injuries. The worst part about that is there is a fairly high risk of head trauma in the sport. Football and hockey have much higher risks, but they've also done significantly more to try and combat the effects in recent years.
As we saw last night, the substitution policies of soccer are one of the biggest obstacles to progress. In almost any other sport, Melia could have been removed with little to no consequences other than simply losing him as a player. Just imagine if that had occurred after SKC had used all 3 subs. There's no chance in hell in comes out of that game in that scenario.