Is Telecom planning to offer Naked DSL anytime soon?
Why would they? as the PSTN is not a regulated product it costs telecom retail sweet f all. NDSL connections (on the telecom wholesale DSL network) actually all connect back to a POTS EN/Port/Linecard anyway its just not activated so you can't use it. Retail/Wholesale pay chorus the same price for the line/MPF regardless of what services they put over it so why not use the PSTN instead of just having it sit there.
I was on the telecom trial for their naked/voip service (aprox 1 year ago) which has since been shelved likley due to UFB. The existing equipment is capable of providing the service.
Going naked with another provider vs having a standard phone and DSL with another provider is only about $10 cheaper a month ... personally i would rather stick with the PSTN as its a lot more resilient to line faults and proven fairly stable over its lifespan which is what you want when there is a power outage and you need to call 111.
having said this ... PSTN is due for decommission 2020 and with UFB coming its days are numbered.
As for the zero-rated national traffic IMO i don't really care there isn't enough content that i get from NZ origin for it to make a difference.