yes but every club would have to do this
what youre suggesting is that only a quarter will have to while another quarter doesn't go further than a bus trip for a few suburbs
Im not suggesting its unfair for perth to have to fly to Auckland, that's a given, i'm suggesting that its unfair that only the teams in the southern division have to jet between these 2 extremities
Sydney clubs in the NRL and Melbourne clubs in the AFL already have that bus trip advantage that you're complaining about. It's the mathematical reality of having 9 teams in one city in a 17 team comp. Just look at the draw for any Sydney NRL club this year for evidence.
Say in a best case scenario you get your wish and a Sydney club plays the fewest Sydney games it can by playing Storm, Raiders, Warriors, Knights, Dolphins, Broncos, Titans and Cowboys all away. Well in that case they will still play 16 games out of 24 in Sydney at a minimum. However, it is mathematically impossible to do that for every Sydney team every year. The reality is Sydney teams will play around 16 to 20 Sydney games a year under the current system.
And they will likely continue to do similar to that regardless of how divisions are structured.
For example here's a best case scenario with 4 divisions. At best with 9 Sydney teams and 4 divisions, each division has to have 2 Sydney teams in it and one will have 3. But for a division to play as equitably as possible, a Sydney team should alternate playing the 7 other Sydney teams not in their division home and away each season. So you have to add another 3 or 4 games. So best case scenario is 15 to 16 games in Sydney for each Sydney club. Again though in reality because draws are never perfect, the reality would be anywhere from 14 to 18. Which even your best case scenario, is pretty much what we have now.
So the point is - regardless of whether or not we keep the current format, a division with all Sydney teams or a divisions with minimum Sydnry teams in them - Sydney teams will always have that advantage.
So the question is if the difference of only 1 or 2 games at best is worth eliminating more all-Sydney matches up games and replacing them with more Sydney vs Interstate team match ups, which as we all know draw smaller crowds on average. I just don't think the case for equity is worth the hit to attendances.
As for Perth, they're playing at home a maximum of 12 times a year regardless of a league or any kind of division format. They will travel 12+ rounds of the season regardless of what format is adopted, so again why not go with the one that maximises attendances and fan interest?