Indigenous food sources make a lot of sense theoretically- my concern is that realistically they don’t appeal to the everday palate. We have been trained to eat high-fertiliser high-water European plants. Kangaroo an indigenous food source which is superior to sheep cow and pig both in its impact on the environment and an individual’s arteries is not a popular choice of meat.
In an abandoned patch of scrub bush tucker may stand a chance. But in land which may be used for conventional fruit and vegetables the overwhelming opinion may be in favour of growing what we already know. Perhaps the two can coexist alongside each other. Indigenous plants would probably tolerate more extremes of heat and water deprivation.
It would be good to have a speaker to educate us on indigenous plants their identification and uses. A course is currently running at Grovely TAFE in Bush Tucker. I think there is also someone at The Gap Transition who has a connection with indigenous people in the area and has written a list of native food plants.