For some reason this thread has become about rationalising Sydney. I'm not really sure why that is, because my OP wasn't really about that, but it got me thinking about how it pertains to the topic and the NRL more broadly.
So thinking about it I came to the conclusion that, at least for the foreseeable future, I can't see the NRL rationalising Sydney or pushing for a proper centralised model. They'll push closer to a centralised stadia model, but it'll still be halfarsed with teams regularly playing games in dilapidated shitboxes like Brookvale and Leichhardt in disparate parts of the city.
So taking those two points as truisms, and ignoring the obvious little things that aren't controversial, how can the NRL possibly increase product availability across Sydney as much as possible?
Well the only workable conclusion I could come up with was that they need to realign the clubs in Sydney so that they represent the population of the city as equally as possible, and particularly have direct representation in each major region of the city. In other words, they'd have to do something totally counterintuitive and double down on the suburban nature of the sport in Sydney.
This method definitely wouldn't be as effective as other methods, as it'd build inherent haves and have-nots, and also require clubs to shuffle around the city regularly to cover population growth and changing demographics (which I think would be very hard to get the clubs and fans to agree to), with a particular requirement of getting clubs to represent, at least, the region of North Sydney and Macarthur on a fulltime basis, with arguments to be made for Wollongong and the CC as well if we include them in the Sydney metro area as is happening more and more.
But if we take the two original points as truisms that is probably the best outcome that is left available to the NRL and sport.
However in saying all that, it should go without saying that, IMO, that set of circumstances would be nowhere near as good an outcome for the sport in Sydney as the other solutions.