Since 1998 when the storm was added we have seen just 2 expansion sides and BOTH were in SEQLD. Now before Perth or PNG have played a single game we're already talking about another SEQLD side.
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I think you’ve missed some crucial context. Which is between 1998 to 2006 Broncos had the entire region for themselves. It’s not like there were added on top of # number of existing NRL teams.
Further to that Broncos were technically servicing 2 cities and 2 other regions prior to the Titans entry and then servicing 1 city 2 regions prior to the Dolphins entry.
Now we are at a point where the remaining region on top of the city Broncos service - isn’t being adequately serviced and it’s growing rapidly (in many areas which give it strong candidacy for a potential NRL club).
End of the day it (and any other would be expansion franchise) will be evaluated based on the metrics it can best hit and what it can offer the game, corporate partners and broadcasters best.