Thanks for the response.
Give or take the odd half million or so, or who's making the measurements, the split between the codes is minimal. Where does the Riverina rate? although it's in NSW, it has a long Aussie rules history, the Daniher brothers are a case in point. Wagga is probably 50-50. Paul Kelly was a star with the Swans, but his hero was Kevin Hastings, the Mortimers chose rugby league.
Whilst I agree that the AFL have transplanted teams in areas where support isn't yet up to what should be the requirement of any AFL franchise. I think GWS is ahead of Gold Coast in that regard, but both are minimal gains in the grand scheme of sporting business downunder.
A north Qld team is a long shot, but I wouldn't bet against the AFL giving that region a team in desperation. As you say, NZ is very unlikely. The Northern Territory is still mainly an Aussie rules region, especially Darwin.
There is still plenty of room for NRL growth, but I hope they will concentrate on WA, SA and maybe another Victorian based team. That's what's so frustrating about their approach.