The Nav aids are an important backup if you lose RAIM or the yanks switch off the GPS when they can't afford to maintain it anymore
I think we need Dick Smith to bring this one into the public arena.
As a nation we need to be autonomous in regards to our aviation infrastructure. Relying on another nation to support our navigational capability is asking for trouble.
While it's not my cup of tea flying an NDB approach in anger, in many places I used to traverse, it was my only option.
I was upset when the switched off the NDB at Perth. The aeroplanes I used to fly when turning onto the arc did not have an RMI that I could tune and select the VOR. The arcs became a messy affair after that.