When you've got a negative population trend, it's hard to argue against migration under any circumstances. Maybe capital and automation take the place of younger workers, but that's a pretty serious bet to gamble social welfare program solvency on.

http://www.latimes.com/world/europe/la-fg-germany-refugees-d...

https://www.theguardian.com/news/datablog/2016/jan/06/refuge...