Discussion: Why unsuitable?

It's got rocks in it :)

First, its three hours drive from Bendigo. Second, its steep and tough. BendigOringen terrain has to be close to Bendigo (and each of the other maps) and easily accessible.

Strathbo(gie)ringen?

There's a lot of Strathbogies. It isn't a place you can visit in one day. Even the rogaine only covers a small part of it.
But l'm in no hurry - we are going to need new terrain for many years (decades) to come.

Not sure the sport is going to need new terrain. There is a large list of no longer used maps an outcome of Melbourne clubs organising fewer events at distance from melbourne. The one thing that may change this is the appearance of a Ballarat local series. They had 40 entrants last week. That's pretty good for a new series. If it continues and grows, Eureka will need more terrain. Maybe the future is bush local series in Ballarat, Bendigo and Albury, with sprint and Melbush-O type events organised in melbourne?

what's all that bright green stuff on the ground - some sort of carpet?

Its processed dehydrated grass. Just add water.