I agree with your insights Jane.
Suburban Melbourne is different from inner-city Melbourne, student ministry is different to ministry amongst young families, or even older congregations. I would even dare to say that Hawthorn is different to Forest Hill, is different to Boronia or Emerald.
Twenty to thirty years ago Melbourne had a "Bible belt" from roughly Hawthorn out to Ringwood. It was also referred to as the "Mortgage Belt" and the "Sherry Belt". There was a great deal of commonality about those suburbs and their residents, there was similar theology and motivations at say Ashburton Baptist, Syndal Baptist, St Columbs Hawthorn, Holy Trinity Doncaster, Mitcham Baptist. There was a lot of links between CMS, Scripture Union and AFES. Not all the churches were evangelical, it's just that I only moved in evangelical circles (imagine when I moved interstate and encountered liberal theology for the first time!)
Melbourne was also very radial, by that I mean that a lot of travel was between your home and the city and links followed arterial roads and railway lines. Living in Vermont I had links out to Ringwood and into Box Hill but I did not generally know people or visit shops or conduct business in Glen Waverley, Mt Waverley, or even Doncaster until I was at University.
My experience of University ministry and inner-city ministry was a focus on apologetics and argument. Many seekers and christians alike were satisified by the intellectual rigour of christianity.
My experience of the suburbs was "Christ incarnate in everyday life" if I may try to explain what I saw. Christianity made sense through a fellowship of believers from a spread of generations with limited transience in a particular area (ie. the local church). It was certainly easier to fellowship with others close to one's own "age and stage" so we were part of a young married home group.
My "home church" in Melbourne's suburbs contains a number of families that are still worshipping in the same church for 40+ years, and many that are 15+ years at one church. Having left 16 years ago it is interesting to visit the church and renew acquaintances. All those "young children" when we left are now older teenagers and young adults, some in leadership.
The paid ministers in the "bible-belt" congregations generally had some "runs on the board" and older children (say upper primary age at least) of their own. I say generally because there are some exceptions that do, or have done, a great work.
I guess a church plant is different to becoming a leader in an established worshipping community (of any denomination). So there may be differences there as well.
I remember when the Diocese of Melbourne started a church plant in the outer suburb(!) of Endeavour Hills. They started with a church (ie. people) and then thought about a building, the minister at the time had to do a lot of teaching to reinforce that the "church" refers to the people not the building.
Again I would say that the key is to listen to God's calling. I have heard it said that he equips the called.
Missionaries are called to all sorts of places: across the street, across the city, interstate, across the world. Regular contributors to this forum correspond from all sorts of places!
I am presently seeing the fruit of the mission thrust of "The West" to Africa as I am blessed in fellowship with many people coming from Africa to work in Australia, their faith is so beautiful. People with dark skins from Zimbabwe and Mozambique, people with white skins from South Africa, Namibia, Botswana. I am sure my friends would consider themselves to be "refugees" rather than "missionaries" but they are bringing the Word of God and their faith with them as they come, whatever their reason for coming.
A word of caution: Love has a greater currency than truth, the truth can be debated with our brothers and sisters in Christ
after we show that we care. Church History is full of argument but: "By this all men will know that you are My disciples, if you have love for one another." (John 13:35, NASB). I have friends that will never agree with infant baptism, I have friends that see no restrictions on women leading worship, I have friends that say christians should not drink.
The central truth is that Christ died for the sins of the world and anyone who wants to come to the Father can approach the throne of grace boldly through Jesus Christ, the mediator and advocate.
Phil Weickhardt
Kalgoorlie, WA