Found this tucked away in the 'industry forums' section of the ASA website.
At the very end of
http://www.airservices.gov.au/projec.../workshop4.pdf
there is this table
Navigation Aid Network
Proposed Decommissioned Year VOR NDB
09/10 0 0
10/11 6 6
11/12 13 17
12/13 3 29
13/14 9 23
14/15 5 18
15/16 8 44
16/17 0 19
Total 44 156
Total Savings $120M
By my count there are about 90 VORs and about 270 NDBs at this time, meaning that ASA intend to remove half of the ground-based navaids within about 6 years.
GNSS is wonderfull (if you've got it), but when I'm in IMC outback, it's comforting to know that there is a ground station somewhere near my track.