Sad news, but we may notice little change to their DRM service. RNZI has been a DRM mainstay for the Pacific and much of CONUS via their "feeder" system for the Pacific Islands.
"The move to a one-transmitter operation will result in a reduced service to current individual short-wave listeners in the region. RNZI will still broadcast in analogue short-wave for extensive periods of each day, but there won't be a 24 hour service as there has been. This is likely to be most felt during breakfast hours when we will need to broadcast a digital signal for relaying stations, rather than an analogue one."
More info RNZI's use of DRM may be found in an interview we did with Adrian Sainsbury in 2012.