Sorry but that is a specious argument. NZ does not have states yet it is hosting games at 4 different grounds located in 4 different cities. Australia is using 5 different grounds located in 4 different cities. As it was a joint Australia-New Zealand bid, and was bid for on a national basis, why the heck should there be more than one city in NSW getting a game?
From NSWs perspective it is better for tourism to have the 2 venues in different cities. So thats enough from the perspective of NSW venue building which is what this conversation is about.
From the perspective of the soccer world cup bid Newcastle has a bigger population than Hamilton. It also has a better history of crowd support for womens soccer than possibly any of these cities.
The main point is lets get 2 cities with world class rectangular stadiums before we get 4 in 1 city.
The record is 20,029 at Bankwest Stadium, eclipsing the previous benchmark of 16,829 set when Australia hosted Brazil in Newcastle two years ago (so it is only slightly second to Sydney).