The NRL won't have the balls to force someone to move. It's a nasty, divisive move that will cause rifts in a game that needs unity moving forward. We don't need another 1997-2002 period.
HOWEVER if someone comes cap in hand to the NRL, or the NRL is forced to intervene in a clubs finances, the NRL will take that chance.
Assuming all clubs are stable in the next 18-24 months, I think they'll finally bite the bullet and go to 18 in 2023.
Those 2 new teams will be Perth and Brisbane 2, you'd have to think. You could definitely make a case for other places but no one in those places is knocking hard on the door.
Next step will be to shake the tree a bit and see who falls out.
Raise the salary cap but do not raise the club grant by the same amount. No more setting the rules to the lowest common denominator.
Clubs need to be pushed to show their worth, without being specifically targeted by the dreaded "criteria".
With this + the new stadiums in Sydney, weak links will fall behind.
That club or clubs will be forced to consider a voluntary relocation, or they'll face failure and the NRL dealing with them as they see fit.
Adelaide, Gosford, and Wellington will be on standby.
If the NRL "saves" a club by moving them and retaining their colours, mascot and history, and removing the people responsible for the failure, most people will view this as good business rather than divisive attacks.
The end result is by 2030 we likely have a comp with 18 teams, including Perth, Adelaide, Brisbane 2, and 1 more new region. I'd expect 7 full sydney teams, with 1 full relocation and maybe another or a split-relocation up the Central Coast.