As you might remember, the measures suggested in Kris i befolkningsfrågan actually led to radicaly increased nativity. Furthermore, having a large population just seems like such a bother. Few people, lots of natural resources, what's not to like? Well sure, it might be a bit hard to defend your resources from greedy populous nations who want to take your wealth, but that can be managed with conscription to provide the sufficient manpower.

Peak oil is not an energy crisis. It is a liquid fuel crisis.