Right now I know you are joking!!! They had to wash the blood of the pitch when they had finished treating him, but you would rather the ref played on, incredible!
So you now expect referees to make medical decisions, on the hoof, while watching and keeping up with play - David Busst was still moving after receiving what many consider to be the worst broken leg injury on a football pitch, so by your logic - play on!
No comedy value intended from here! More I was thinking how your suggestion would work?
So a player goes down injured and the big centre half gives it a mighty hoof (yes I know, it's always the big centre half) which sends ball to row Z of the stand. Referee now has decide if said centre half...
You all appear to be forgetting the Arsenal vs Sheffield United FA Cup game from 1999, where Arsenal scored a goal in similar circumstances to beat United 2-1.
Realising his players' error Wenger offered a replay to United, which the FA sanctioned - Arsenal going on to win 2-1 again!