Unless for example Sydney NRL clubs are going to become as big as European soccer clubs and build their own stadiums then there is very little choice other than shared stadiums.
Also, I think people sometimes underestimate the problems with upgrading these stadiums.
Firstly, the facilities of some of these suburban stadiums are so far behind the times. Even if you did upgrade say Leichhardt it would still not really be suitable. For example there is just not enough parking and you have very little corporate facilities. So essentially you are putting lipstick on a pig. Shark Park and a few other are the same, albeit they are slightly better than Leichhardt.
Secondly the stadiums and surrounding areas are just not big enough. With these facilities, in order for it to actually work, you would need to knock the whole thing down, rezone the land and make them bigger. That’s not going to happen.
Thirdly, people argue against shared stadiums because of accessibility, yet having stadiums in outer suburban areas, particularly when the city is so difficult to get around, is even worse for accessibility. Unless transport becomes so much better in Sydney (a lot is being spent but the whole plans won’t be finished for another 15-20 years) than surely having stadiums in areas accessible to the most amount of people makes so much more sense than having them in inaccessible areas. How many people outside of Cronulla are going to Shark Park for example?
Shared stadiums make sense. Have the majority of the games played at SFS and Commbank with Penrith playing at Bluebet and Manly at Brookvale. That’s manageable. It’s also a lot easier to negotiate upgrades if and when you require due to shared tenancy. Also you could look at a stadium in SW Sydney when the airport brings in massive growth in those areas.