Dick,
A random thought based on nothing more than my own juices;
Could it be that this may spur a period of fleet renewal or an opportunity for Australian companies to become leaders in ADS-B globally? At least it's not a weird unique system that won't ever be used anywhere else.
As many corporate aircraft go deeper into their inspection/overhaul cycles, they may become candidates for replacement, rather than upgrade. They may also attract a higher price on the overseas market than when they become clapped out bolt buckets. I doubt this will change the recession forced sales much anyway.
Hardly seems worthwhile for a lazy 100k+ but you never know.
BTW - my guess is that Qantas is going to pounce on any cancelled 787 orders to punt the 767's as quickly as possible ala 2001/2......