There is no need for Aussie players to go and play for a PNG team. They will be fine just using locals and other islanders. This is not about having a team that will win the comp and I don't know why fans of other teams are concerned about them not having a crash hot side. And even then they will still be competitive at home, just as they are against the Prime Minister's XIII and have been in other internationals.
They will get flogged week in week out without Australian players. Sure they might get up for the odd game but over a season they will be beaten heavily more often than not.
Port Moresby is consistently ranked as one of the worst cities in the world to live, mainly because of the crime there. PNG is also rife with health problems, such as HIV, malaria, cholera etc. It is very underdeveloped - unemployment in Port Moresby is over 60%. Only about 60% of people are literate, life expectancy is less than 60 and the per capita income is something like $1,200 (I read somewhere that 25% of people live on less than $US1.25 a day).
Also, while PNG has about 6 million people, there are only 300k or so in Port Moresby. Port Moresby is not connected by road to any other major centres and so is not accessible to most of the 6 million people. The main way of getting around is by plane, which the vast majority of people can't afford.
I wouldn't bank on players from other Pacific island countries wanting to play in PNG either. People from Tonga, Fiji , Samoa etc are Polynesians and have significant cultural differences from the mainly Melanesian people in PNG. Also the standard of living in those other countries is a lot better than PNG, so its quite likely the Fijians etc would not want to lower themselves to the level of Port Moresby. Its a bad place even by third world standards.
As for Australians, the only way they'd get them there would be to give them a salary cap of about $20m tax free, and provide them with a secure compound to live in, armed security, etc, etc.
As for people who say we should have a PNG team but based in Darwin, they should realise Darwin is about as far from Port Moresby as Hobart is from Brisbane - can't see any advocates for a 2nd Brisbane team playing in Hobart?
PNG in the NRL is not going to happen in the next 100 years. If government money is put to it ahead of health, education, law enforcement and development that would be a criminal misuse of resources. The promises made by the PNG government are merely attempts by their ministers to get a bit of popularity out of the love of RL thats in the country.