I can see your point but I don’t think the population around the area would fill the market.
A lot of people will have to fly and I would rather fly the bit extra to a lovely departure town.
Cairns is pretty close to the distance from noumea as Brisbane is ,about 2 days sailing time.
Cairns is closer for the Asian and U.S. travellers.
Brisbane badly needed a good terminal but it has something missing.