Different expansion clubs will have different fanbase sizes. This isn't the only metric for measuring a club's potential. For instance, a club in a metropolitan area will likely access more corporate support than one in a regional area. This just shows where your favoured expansion club will sit in the scheme of things in terms of ongoing support once the dust has settled. For comparisons' sake, I've included all the existing football clubs in Australia and New Zealand.
God Tier – The biggest football clubs in the country out of any sport
Brisbane Broncos, South Sydney Rabbitohs & Parramatta Eels
Collingwood Magpies, Essendon Bombers & Richmond Tigers
A Tier – Fans spread across 2-3 states/nations and/or dominating a state/nation
PNG NRL TEAM
St George-Illawarra Dragons, Wests Tigers, Canterbury-Bankstown Bulldogs
West Coast Eagles, Adelaide Crows, Hawthorn Hawks, Carlton Blues,
B Tier – Fans spread across their state/nation and/or in the top 2 clubs in those areas
SOUTH/WEST BRISBANE NRL TEAM
Dolphins, North Queensland Cowboys, New Zealand Warriors, Penrith Panthers, Sydney Roosters
Port Adelaide Power, Fremantle Dockers
Auckland Blues
C Tier – Fans dominate a large regional area or are a non-major code in a larger city
PERTH NRL TEAM, ADELAIDE NRL TEAM
Canberra Raiders, Newcastle Knights, Melbourne Storm
Geelong Cats, Sydney Swans, Melbourne Demons
ACT Brumbies
Sydney FC, Western Sydney Wanderers, Melbourne Victory
D Tier – Fans dominate smaller regional areas, non-major codes with niche following in large city or suburban/minority enclave clubs
WELLINGTON NRL TEAM, CHRISTCHURCH NRL TEAM, WESTERN MELBOURNE NRL TEAM, CENTRAL COAST NRL TEAM, BEARS NRL TEAM, SUNSHINE COAST NRL TEAM, CAIRNS NRL TEAM, BRISBANE-PASIFIKA NRL TEAM, NEW ZEALAND-PASIFIKA NRL TEAM
Gold Coast Titans, Cronulla-Sutherland Sharks, Manly-Warringah Sea-Eagles
Brisbane Lions, North Melbourne Kangaroos, St Kilda, Western Bulldogs, Tasmanian fumbleball team
New South Wales Waratahs, Wellington Hurricanes, Waikato Chiefs, Canterbury Crusaders
Melbourne City, Adelaide United
E Tier – Would or are perpetually struggling for fans and likely remaining at this tier
CENTRAL QUEENSLAND NRL TEAM, CAIRNS-PASIFIKA NRL TEAM,
Queensland Reds, Western Force, Otago Highlanders
Brisbane Roar, Newcastle Jets, Central Coast Mariners, Wellington Phoenix, Perth Glory
F Tier – Failing or failed
DARWIN NRL TEAM, DARWIN-PASIFIKA NRL TEAM,
Gold Coast Suns, Greater Western Sydney Giants
Melbourne Rebels, Fijian Drua, Moana Pasifika
Macarthur Bulls, Western United