Perhaps you should talk to your ATS systems people alphacentauri because the information to Industry comes from them. They also indicated that some navaids are required for air traffic management outside surveillance coverage, due not all aircraft being equipped with GPS-based navigation systems.
ASA and Defence are not the only two "permited" to operate NAVAIDS. Quite a number of NDBs are privately operated - Renmark and Shepparton are just two that come to mind - and they have been offered to aerodrome operators for some time.
The last we heard about the SY VOR was it was to be shut down for a period while new hangars are being built, and after to be reinstated.