This is a matter for the Aussies to worry about. The A-League owners don't want us gone and that's an end to it. The insistence on some Oz fans on turning everything into a way that they can get #NixOut is reminiscent of US Right-wingers trying to make up scenarios in which Trump gets another 4 years. Not going to happen now matter how much they wish.
Either the Nix are going to be "immune"; or there will be some kind of deal where we forfeit our licence or have to move to Oz permanently if we come last 3 years in a row or something like that. Semi-open, semi-invitational leagues are not unknown elsewhere. If we can't play ACL then it's fair that we have at least partial immunity to pro/rel.