It is an interesting one. Umpires sometimes look like they are ready to blow the whistle at the slightest infraction, and at other times can't seem to find the whistle and let all sorts of rule violations go. Then they will have 2 or 3 rule violations occur and pull out one of them to pay a free. There is no way this doesn't lead to inconsistency.
I recall going to a game in the late 1970s, we were playing North at Arden St, both teams got (from memory) 44 free kicks each. This was normal and the umpiring was even handed as far as I observed. No-one back then was complaining that the game didn't flow, it flowed better than it does now in some ways.
The issue I have is that the AFL, in a vain attempt to keep the game "flowing", set a goal to reduce the number of free kicks given. What this has led to, quite predictably, is that the umpires don't pay every free they see. This has, again quite predictably, led to massive inconsistencies. It also leads to players, who are now full time professionals and have the assistance of club staff employed to analyse games in slow motion, seeing how far they can go before being penalised. The other aspect of trying to keep the game "flowing" is that they basically allow throws. The rules on handpasses have not changed, but the way the rules have been interpreted is massively different, and it takes away one of the unique aspects of our game.
Some suggestions above on reducing the interchange bench have merit, the only reason the game can be a rolling maul is if players can run for the whole game. On that score, reducing the time of each quarter would make things worse. But one thing I would insist on not changing, is the way players can, with very few restrictions, roam to any point on the ground. Without an offside rule, one of the unique and defining features of Australian Football has always been that it is a 360 degree game. It has to remain a 360 degree game and restricting player movement would change the game such that it is no longer the same game.
DS