Just to elaborate on what that'd look like at 26 hypothetical teams (this is why expansion should take geography into account)
VIC 10
SOUTH-WEST 3 WA 2 SA (5)
NORTHERN 4 QLD 1 NT (5)
EASTERN 3 NSW 1 ACT 1 TAS 1 NZ (6)
Vic conference plays each other once, the other conferences play twice (unless they reach 7 teams but probably never). Then you play as many teams from other conferences once as possible (and play everyone else every second or third year if necessary).
23 home and away games per year (rotate Gather Round throughout the interstates plus the Top End).
Top 10 finals system with four playoffs (10 v 11, 9 v 12, 8 v 13, 7 v 14). Extra wildcards if a conference winner finishes below 14th in the final ladder.
VIC 10
SOUTH-WEST 3 WA 2 SA (5)
NORTHERN 4 QLD 1 NT (5)
EASTERN 3 NSW 1 ACT 1 TAS 1 NZ (6)
Vic conference plays each other once, the other conferences play twice (unless they reach 7 teams but probably never). Then you play as many teams from other conferences once as possible (and play everyone else every second or third year if necessary).
23 home and away games per year (rotate Gather Round throughout the interstates plus the Top End).
Top 10 finals system with four playoffs (10 v 11, 9 v 12, 8 v 13, 7 v 14). Extra wildcards if a conference winner finishes below 14th in the final ladder.