There's a NOTAM out about modernising of ground based navaids, as many will probably know. They're shutting down old equipment but also putting up new NDBs and VORs - as far as I know the ground based aids will be around for a good few years yet.
Met a bloke up at TNK last year who was going around the country setting up NDB towers and getting them working, had the wife and kids (home schooling) in a nice Winnebago setup and was following the work round Australia over a period of years. Nice people, looked like he had the right gear and knew what he was doing too!
So our navaids should be in reasonable nick.