it would be interesting to know whether Kordia's proposed DAB network would provide the same coverage footprint. I'm guessing there is no hope it would fill existing FM dead spots like Blenheim - Kaikoura or Blenheim - Nelson.
Maybe it would fill existing FM dead spots. According to the NBR article linked to above -
"If the go button is eventually hit, Kordia says it could build a nationwide DAB network for as little as $10m - chump change, in broadcasting terms." Double the price from $10m to $20m and the job could be done with nationwide coverage - still a small price to pay.
If Kordia are given the go-ahead and are prepared to spend the "chump change" let them do so and see what happens. A high price was paid for FM frequencies in the past. Like the first LCD flat screen TVs that cost $20k, now some 4K TVs sell for 10% of that price. Perhaps too much was paid for the FM frequencies but that should not stop cheaper DAB+ technology.