What's needed is a facility that has a sealed track, a dirt track, a motocross track and a 4WD track.
All we need is some super rich guy who like his motorsport to buy some land and build it up, shouldn't cost more than $50,000,000.
Have it close enough to the big smoke to get in the punters but far enough out to stop the whinging bastards happy.
If I win the $70,000,000 lotto next week I'll do it, I'm sure you could make some dollars by getting all the disciplines using it, hell the sealed road, tower and sheds would be the main things that big dollars would be spent on, the dirt sections are the work of a loader and grader which would only need minimal maintenance and the 4wd track wouldn't need maintaining much as they like getting bogged and self recovering anyway.
All we need is a table top mountain somewhere with about 3 square kilometres.
And a rich guy.