No Development Zones wpuld definitely be a good thing, but no access to anyone zones wouldn’t be.
The Australian Bush has been maintained and curated for at least 40,000 (probably closer to 80,000) years and closing off access to anyone is not the answer.
If you visit State and National Parks that restrict public access (such as Bunyip State which only allows Cyclists and Horseriders) you may notice that a lot of the tracks are overgrown (to a point where Cyclists and Horseriders can’t use them).
Meanwhile, other Parks that do allow 4WDing have been chewed up to a point where they are inaccessible to anything but a Unimog.