The biggest change is going professional as a result of the huge TV media rights entering the game.Small correction, the VFL did expand to become a league it never was. Same continuous comp no doubt but certainly went from a state suburban league to a full blown national comp we have now. Nothing was created but the league now is polls apart from what the VFL was.
All sporting leagues that have been around for 100+ years would be polls apart from what their competition originally was.