I agree with the sentiment expressed here. People might roll their eyes at this and scoff at such a comparison, but the same thing is often true in heavily urban, rundown areas. Flint, MI, (the former murder capital) is what I have in mind. It is mostly made up of what people call "the hip-hop" culture. It's a different world -- the mentality, the mores, the customs: they're simply different from "us" and it's detrimental to pretend that they're not. And there is one church in the city that has taken this into consideration; I find it sad that more have not.
However, I do tend to not like the term "missionary" being applied to places where the gospel already is established. I think Atlanta has no need of missionaries. Its churches which are already there simply need to do the work they were established to do; and if we feel that they are not, then through church relations with them we ought to encourage and admonish them; and if they request our help, then we certainly can send our own ministers/members.
The reason I really don't like the term being used in local settings is perhaps more of a pet-peeve. Especially among young people, we often find pastors or youth leaders, etc., telling youths that they are to be missionaries in their schools, or older people that they are to be missionaries in their work places. I honestly don't think this is prudential counsel. This sends youths off into their schools thinking:
1. Simply being a Christian is not enough; I have to be realize that I am a missionary. I have to be more spiritual. Simply living a life of righteousness, of faith and obedience toward God is not enough; I have to be more; I have to have a spiritual office or duty. I notice that this tends to several things:
a. Pride toward those "lower" Christians who have not yet realized these things.
b. Insecurity: once we start down this path it always leads to, "Am I doing enough, or am I doing it good enough." This overspiritualizing of life tends to take our focus off of Christ, and put it onto ourselves.
2. To a youth at school, simply attending school is no longer a noble thing in and of itself. The reason they are at college or high school is so that they can be a missionary there. School itself becomes secondary. Simple human things, or things which pertain to creation are simply no longer good enough. There has to be a spiritual meaning and purpose to everything. Being an engineer is no longer a good in itself -- in fact, it might be looked down upon; however, being a missionary among engineers is good.
I think that both of these lines of thinking are dangerous, and lead people into having to try to be more than they actually are in Christ, and more than they probably are supposed to be.
I realize this has strayed from the OP, but this is my pet-peeve reason why I don't like the use of the term in local settings. My real thoughts are above, but these last reasons certainly make me all for using the term "missionary" in a much more restrictive sense.