There's not a lot to go on from this article for the reasons why some Dutch are leaving. I'm aware, of course, about the problems with the Islamocrazies in the Netherlands and elsewhere, but I would guess that much of this emigration has to do with jobs. After all, it's not like the Dutch are fleeing to Peru to get away from the Islamonutjobs, they seem to be going right next door. And, from the article, many Eastern Europeans are moving
to the Netherlands.
I'm not sure that the issues raised in this article have to do with the "Death of the West" necessarily.