Until now, the trend has been for Kiwi veterans to head north in search of a last big contract before retiring, but Sopoaga believes that more 20-somethings are considering that career-defining step.
''I think it is a pattern. For a lot of guys like myself, who come from big families, from low socio-economic backgrounds, the chance to change your family's life is pretty overwhelming. It's not something you should take lightly.
''Sometimes the jersey is not enough for a better life. It is special when you do get it, the experiences you do have are pretty surreal, but down the track those things don't pay for a roof over your head.''
Charles Piutau has been a trail-blazer for the younger generation with a greater awareness of their market value abroad.
He abandoned his All Blacks career to move to Europe and is now on a £1million-a-year deal at Bristol, after spells at Wasps and Ulster.
Sopoaga said: ''I think he's one of 12 or 14, so you can easily see why the riches of Europe are so appealing for young guys. Rugby doesn't last forever and I think younger guys are becoming more aware of that. I think that's a good thing.
''For me, having my daughter changed things - how I looked at rugby, how I looked at life. Having her, the picture was changed; where I wanted to head, what I wanted to do, how I wanted to set up my future. Rugby isn't forever, it can all be taken away from you, that all came into consideration.
''Every kid growing up in New Zealand wants to be part of the All Blacks. It is pretty special, but at the same time, it was time to try something else. I made peace with the decision.''