Emigration figures are always difficult.
Personally, a lot of family and friends have left, and are still leaving. Nobody has ever returned.
I have heard of another family returning from Australia, apparently the wife missed her SA family, but I think it also had something to do with the husband being unable to retain seniority over in Oz. AFAIK it is very rare for people to return.
I had an Oz Permanent Residence Permit, but was unable to go as the wife (now ex) decided that she did not want to go after all, and I couldn't really go on my own because of the kids. We had already landed, and Australian Immigration regarded me as a Permanent Resident. But that expired a few years later.
Son has now left for Canada with his GF. I could in theory join them.
I regret not having gone to Oz, but it was out of my control.
As a result of all of this I now have a lot of family and friends in Australia and Canada. A few in the UK.