Well I think NZ needs to decide either to have a capable navy of 3 decent "frigates" or perhaps 2 frigates and 2 capable OCV (less good but I could see it being an argument for it) or 3 corvette type ships (less good again but again I can see an argument that would be popular in NZ) or just op out completely and have "patrol vessels" of sorts.
NZ does really need 3 frigates, anything else is a huge compromise on the objective they set out for.
I suppose the real answer is, it depends on the thinking of the Govt of the day.
NZ still needs to fly the flag (and exercise) around SE Asia so Frigates are still the best option in that regard. At this point in time, perhaps the question is, is two enough? When the ANZAC's are to be replaced in the 2020's, in the lead up the other question might be "what with? ANZAC II's or well armed OCV's" etc.
Once more details of the ANZAC II/OCV are released we can certainly debate the merits or otherwise of the two (and it will be good practice before the peaceniks get involved in pushing their barrow)!
But there's also a place for "patrol vessels", it's an area that is visible and tangible to the public and people of the Pacific (in terms of EEZ, customs and general assistance etc).
(And now NZ has patrol vessels, it makes it easier to better define the roles of Frigates and patrol vessels operationally and their strength's and weaknesses etc. Meaning the peaceniks have lost another public disinformation campaign along the lines of the Frigates don't do enough EEZ patroling and thus the Navy isn't orientated correctly in terms of their perception of NZ foreign policy and aid etc).
I'm comfortable with the OPV's - NZ needs more hulls in the water and eyes at sea, as long as the OPV's are connected into the military networks (eg
Siprnet etc) which I assumed they were(?), then they're (with helo and future UAV) another ISR type asset useful for NZ and other like minded nations mapping movements in the south Pacific etc.
All I'd like is for the OPV's or future OPV/OCV's to have better sensors for detecting surface and sub-surface objects, the ability to add on some torp tubes on the container deck (as and when required), possibly the replacement of the 25mm bushmaster with a 57mm gun with minimal deck penetration (eg the
BAE 57-mm Mk 110 or other) and they should be able to sink any raider/spy vessels or subs, that are most likely to be encountered around the South Pacific. Anything more threatening would be detected and passed onto a NZ (or friendly) P-3 or Frigate (or Destroyer or Sub) to sink etc.
In other words for the Pacific, all manner of eyes and ears from the air and at sea, be that NZ, Aus, French, US etc, monitoring sea and air traffic, via secure networks back to command posts etc.
In terms of combat operations, NZ will always be the junior partner if applicable, but as events in East Timor demonstrated, the NZ Frigates do need to have the top of the line sensors and counter-measures, and that's not too far from home let alone somewhere more distant in high threat environments. For these reasons I can't really see the two major NZ political parties ditching the Frigates.
Would NZ not be better off with a commercially standard concept like the Absalon (maybe slightly larger at 7,500t). 3 of these replacing the current 2 frigate and eventually the Canterbury. Maybe supported by an OPV/Light frigates based on a FS2000 like the KD Lekiu
Maybe and some kiwis here would support that. Although personally I'm not so sure nowadays, as NZ now has a Sealift vessel and OPV's so these existing vessels would be better suited to duties in the Pacific than Absalon Frigates that offer additional (capability, not necessarily needed) but limited sealift capability. If the Absalon's were suitable for NZ's presence in SE Asia then perhaps, but realistically would NZ in SE Asia need an Absalon mult-purpose type (over a Frigate)? I'm not sure that would be so (but happy to be corrected by others).
What I'd like instead is the ANZAC II (T26/F100 mod etc), seeing it has all that extra space, is room to house troops and some of their cargo (eg for SF insertion etc) or govt agency staff etc. That would go along way to justifying the ANZAC II to the NZ public - greater utility (over the ANZAC's) etc.