Yr right 'giggles' ...........
Writing to the activists won't acheive much. Support needs to be expressed to Federal members of Parliament, in particular the Minister...... But any group that has an influence at any level as to the safe operation of EN is to be considered a threat.
I believe they won't ever close it down in my lifetime & they won't be able to significally change the airports master long term plan either but they could very well modify it thru being a bunch of pests to the point where it becomes less & less attractive to A/C owners & therefore over time slowly loose it's impetus (not too sure on spelling on that one) as an integral part of Mebournes transportation system.
For now it's pretty safe, or should that be 'safeway'?
Cw