Mitchell has not given up.
"If TVNZ get together with a communication partner [such as Spark], then you'll have online streaming and free-to-air broadcasting which would be a win-win for the public.
"Digital platforms have got to be factored into play. So much is done from mobile devices these days," said Mitchell.
Sky Television hold the rights to all New Zealand and Sanzaar-based rugby competitions, from which NZ Rugby is estimated to receive $70 million annually.
Regardless of any party's intentions, the rugby rights market looks set for a restructure.
As the Herald on Sunday reported last week, "rugby maybe hasn't known such a world of opportunity since 1995 and the switch to professionalism".
The evolution in the way games are consumed means digital and television rights could be unbundled and Sky would struggle to dictate the same terms.
A Spark-TVNZ bid could lend traction to NZ First's idea.
"It's still a fair way off, but looks a good possibility," Mitchell said. "Anywhere you can take away the monopoly or duopolies that exist, and offer better opportunities for taxpayers as a whole, has got to be a good thing.
"I'm not anti-Sky. I have Sky myself and they do a great job, but we've got to ensure those who can't afford it still have access to the New Zealand sporting culture."
Sky use Prime for some of their sporting coverage, but those broadcasts tend to be delayed or punctuated by advertisement breaks.
Mitchell said the benefits of open access outweighed the costs.
"We've had free-to-air sport in the past and I think a big part of the obesity problem in this country is that kids feel disconnected from sport.
"Nothing's more empowering than seeing top sportspeople inspiring kids to get out and do the same.
"When you have low socioeconomic areas where people don't have access, we see participation rates drop drastically."