I read Welnix's message as simply being: if Wellingtonians don't support the Nix then why bother ? I just see that as being upfront. I don't read it as a threat at all.
With respect to moving to Auckland I read the comments meaning a couple / few games not the whole club - why would they do that - they're Wellingtonians whose motivation is more the City than the sport.
Message is the world doesn't owe us the Nix and if not enough want it then they'll move on.
I am personally confident that results on the pitch will take care of results off the pitch.