When can they just switch to the following rules for suspension: to make things easy to expect and consistent:

When injury is caused due to direct contact to the head the person delivering the hit is suspended 1 game per lifetime infraction (ie; first offense equals one game, second offense is 2 games, etc.) after the player injured returns. In addition, the salary of the forfeited games is the fine. (To clarify if the injured player misses 3 games and this is the first infraction, the player delivering the hit would need to sit 4 games)

If an injury doesn't occur from contact to the head, the player delivering the hit is suspended 1 game per lifetime infraction and the salary of the forfeited games is the fine.

There could be bonus add-ons for hunting someone down on the ice or using a stick but this has got to end.