Despite the 19 player squad, the number of interchanges (and 4 bench players to be used) remain the same. Therefore could not have too many low minute impact forwardsYes, first thought is to think you would put backs and halves to cover for injury and concussion but coaches don't plan for this. Their first thought is to win the game.
I'm thinking the trend would be to put in impact players.
There will be less call for Terrel type endurance players and more call for the Royce hunt type impact forward.
I think this rule will affect the game more than they think.