LOL just playing devils advocate - doesnt matter what age he is, so many parents move their kids here at all ages - you see the ones who drag their 16 year olds kicking and screaming away from all they know and love. Age is, in essence, irrelevant in this case - people do it all the time in reverse and no one bats an eyelid just pats them on the back and tells them to go for it, they are doing it for the better life blah blah blah. There is nothing inherently better about Australia, it is just a parent's itch for adventure that brings them here, usually. Often an opportunity not to be missed but rarely is it about the kids although that is the usual catch cry.
At 3 your lad probably has a strong connection to grandparents, aunts, uncles, cousins, whatever - do you think it is a good move to take him away from them? Attachment is very strong to little kids some times and it can take them a long while to get over that loss. Once they do get over it they can have a real sense of isolation because they dont have grandma to come and see them at school on grandparents day, watch them swim in carnivals, dance in shows, see them win certificates at school, cry with them when their pets die etc It is an isolating life no matter how many acquaintances you have - at least for a generation then they begin to make their own families, the oldies die off and they become the elders with their own kids and you become the grandparents.
Would you really condemn someone you love to living in a place which makes them chronically miserable and depressed and deny them the support of extended family if they decide they need it? I sincerely hope not.
You are right, I am here against my will, I hate it with a passion because I am trapped but I am a strong woman and have made the least worst choice and got on with it with some semblance of compromise which sees me go home once or twice a year to retain my sanity. Doesnt mean I have to like it and it certainly doesnt mean I stay silent when I see other women being trapped in an even meaner situation ie having their kids used as pawns against them in a nasty little game of power to get their own way (I say women, as it usually is the women although there are occasional chaps who are trapped because of their wife's intransigence - apologies to those blokes who are also doing it tough).
So, in a nutshell, saying you wouldnt go back because your 5 year old (for arguments sake) loved his life here just wont fly - most 5 year olds couldnt give a toss if they were in Towcester or Tuggeranong just as long as mum and dad were happy and the people that love them are in their lives.