Don’t think it’s in NZs best interest to finish it. Although quality of opposition isn’t great at the moment the likes of SA and Argentina leaving showcased a need to play opposition with different styles to our own. Going it alone with just the NPC isn’t financially viable, yes the NPC is an important development tool but it also costs to run rather than a money, the current NZ super rugby sides are essentially combinations of 3 or so NPC teams so the quality of opposition would be reduced.
I think ditching Super Rugby & going back to NPC could only work if the top few NPC teams end up in a more lucrative "champions league" style competition against the best of other countries competitions... but...
A) Other countries in the Pacific rim will struggle to produce strong domestic competitions in isolation as "qualifying competitions"
B) "Champions league" style setups have a habit of entrenching power in a few teams.. and if the top 4 or 5 NZ NPC provinces qualify, chances are it'll be the same provinces year-in and year-out.
Love it or hate it, the Super Rugby structure works for NZ, and the closest NZR will get to scrapping it and going back to NPC is re-drawing the Super Rugby franchise boundaries to go from 5 to 6 or 7 NZ Super Rugby teams.
Maybe these seven in a restructured Super Rugby.......
* Blues (Northland/North Harbour/Auckland/Counties) - an "Greater Auckland-Northland team"
* Chiefs (Waikato/Bay of Plenty, Thames Valley in Heartland rugby) - - Waikato/BOP - Based in Hamilton, a game in Rotorua
* New Western NI team (Taranaki/Manawatu, with King Country & Whanganui in Heartland rugby) - taking Taranaki from the Chiefs & the others from the Hurricanes - based in New Plymouth with a game or two in Palmerston North
* New Eastern NI team ( Hawkes Bay, with Poverty Bay, East Coast in Heartland Rugby - Hawkes Bay up to East Cape - based in Napier
* Hurricanes (Wellington, with Horowhenua-Kapiti & Wairarapa-Bush in Heartland Rugby) - Brings their focus into Wellington, maybe a trial each year in Masterton
* Crusaders (as per current feeder teams)
* Highlanders (as per current feeder teams)
[Edit] or they can just keep on the shambles of a thing they have now, honestly the current state just makes it easier for the NRL... and I hope we take it to them with a 2nd & later 3rd NZ NRL club.