See that QLD State Premier in last few days has said, she won't reopen state borders (ie no 2 week quarantine travel requirement) with VIC & NSW until there is no longer any Covid community transmission in those 2 states. She estimated that won't be until post Xmas with VIC, though any concrete dates no one really knows. I guess the same will apply to NZ, absolute no chance of travel there until back to zero community transmission in NZ.
However I understand QLD is still open to quarantine free travel with TAS, SA, NT & WA. Think I have that right.
So could the FFA/NLWG try for 3 hubs - one each in Brisbane, Adelaide & Perth. Each of 4 teams playing, and travelling in and out to the other hubs? At least that way you get a bit of travel, which players would probably actually enjoy, presume crowds would be possible - and then just hope that eventually playing in NSW and VIC becomes an option. The AFL I note are operating their season at the moment as a bit of a travelling Australian roadshow, skipping VIC and NSW.
But whatever setup season 2020/2021 kicks off with, it's very hard to see how Nix can host any home games, and so avoid relocating to Aussie again. I just don't think there will be a political appetite for giving Trans Tasman travel exemptions to sports teams.
More likely that exemptions would be granted for player's immediate families to join them in Australia. That's going to shape up as a very key solution for the FFA/NLWG. Getting travel exemptions for player's families to join them in some sort of larger hub(s). Especially important for retaining visa players like Ball & Davila, or trying to sign new visa guys (going to be tough).
NRL tried and failed on behalf of the Warrior's player's families. No surprise 4 players got sick of it all after a few months, and returned to NZ. Hopefully those running the A League have more luck.