The current NZFC format has worked for 15 years with a few tweaks, after the previous 15 years when they tried a dozen different formats and all of them failed for varying reasons. Why mess with success because of a temporary funding hiccup, especially when a plan for development/expansion was already in place.
Because it is impossible to call the current format and the majority of entities that take part in it a "success," for starters.
Compared to everything that was tried 1990-2004, it is a success. It pays not to have unrealistic expectations in NZ football..
As to the individual entities involved, isn't that what NZF's existing plan is meant to do - re-align the HandyPrem with the winter competition "gradually", rather than throwing it in the garbage and starting from scratch?
I honestly don't see any reason to believe that "Superclub 2.0" would be any better than the original version, just that some people have short memories. You have to explain what the "context... and reasons for change" would be - I can't see anything apart from "saving money", which is a bad reason to do anything in the long term.