Are you actually serious?
The AFL is having one of it's best seasons and none of the"Big 4 are having healthy years nor are they achieving much. Hawthorn are pulling crowds to make even Collingwood jealous these days.
The AFL does not need the so-called "Big Four" to be healthy and the competition is doing fine without them dominating. Look at the EPL - would you say that competition is unhealthy because Leicester won the title and Manchester City didn't?
The dynamics of the State based comp days is SO irrelevant to the reality of the national comp.