As a result, Game of Thrones unleashed a lot of carnage with its much-anticipated episode without Jon being among those lost, but there might have been a lot fewer corpses in general had dragonglass projectiles been part of the plan.
Obviously, dragonglass arrowheads would have been more effective against Viserion than Jon Snow merely screaming at the beast, which was a course of action that would have led to Jon being toast had Arya not slain the Night King.