Problem (and the people from the southern states might be able to elaborate a bit more) is that the Alliance had no clear identity for people to rally behind. Simply being NOT something isn't really an identity people are going to invest in. Whereas the Kiwis have a clear identity, PNG has a clear identity, Tonga and Samoa have clear identities. But put them against the Aussies and (usually) the Aussies will account for them easily. It's why Origin left Test football behind as the pinnacle of the game, and also why the old Interstate series was scrapped for the Origin concept. But if you put NZ or PNG against just NSW or Qld, it would be a more consistent contest, on top of giving those teams more experience against quality opposition.