Of course Qantas will employ people in overseas bases, it costs a hell of a lot less than using people in Australia. Just take a look at every other industry around you. There is an ever growing number of companies prepared to use overseas labour, why should'nt Qantas?
I'm afraid the old argument that these people are incompetent or poorly trained won't hold up. Don't get me wrong, F/A's do fullfill an important safety role but it's not rocket science. Standing up and telling people how incredibly clever you are and that no one else could do the job as well as you will simply p#ss people off!