The game should continue to shore up interest in RL strongholds, rather than into markets like Perth or Adelaide. The latter in particular is even further behind Melbourne in its understanding that ‘rugby’ refers to rugby union, not league.
Nor is it a market with much ‘wriggle room’ left:
Adelaide is already home to two AFL franchises;
an A-league team; plus
basketball, et al.
Adelaide is now Australasia’s (Auckland overtook Adelaide decades ago) sixth largest city (down from third about 60 years ago), with historically the slowest population growth rate (although there has been a strong uptick recently) of the mid-sized mainland capitals.
If you must push into AFL territory, there is more upside going back into Perth, a city with a bigger population than all of South Australia - but only after you have secured the flanks in NSW, Queensland and possibly the South Island.