People emigrate to places where they can have a better lifestyle. But that's not a static situation. Very often, the economic situation becomes reversed, with the new country going downhill, and the home country booming again.

It's quite common for people to return to their home country as the economic conditions become variable. It's not a failure, just that conditions change all the time.

Sometimes young people emigrate to 'make their fortune'. Then they come back to their more familiar homeland bearing those riches with them, and looking for a spouse and a home. That's a different situation again.