It's also worth bringing into this discussion that football really needs to think about introducing 10 minute temporary substitutions for a head impact assessment. Almost every other major contact sport in the world has introduced some kind of process designed to encourage teams to take a player off and submit them to the appropriate tests - football insisting on failing to do so is starting to look dangerously close to negligent.
agree, this is a good suggestion as well.
however...as a sceptic though i foresee teams taking advantage to essentially make another substitution in the latter stages of a game. so you'd need rules on who decides that a concussion sub is allowed and that they can only be replaced by a player in a similar position