Umpiring/refereeing is hard; especially Aussie Rules.
I wonder if one day there will be tech (likely in glasses) that will live record a game from an umpires point of view and be able to judge free kicks.
So you'd have some kind of model (AI I guess) that understands all the different rules (free kicks/fouls/penalties) in a sport.
The model would be trained to interpret in real time when a free kick needs to be awarded and notify the umpire maybe via some kind of display in the glasses.
The umpires job would then become a lot simpler. They and just be to actually award the free kick and be in control of the game.