Late Stage Capitalism

Space elevators are likely not feasible. Off-planet mining would probably be a better fit for autonomous robots as long as weight is a factor in sending things to space. Plus, you won't get people to space with a railgun.

As for the question of population maintenance, it's not necessarily a crisis in itself. One thing is for sure, though: any policy viewing women as docile broodmares or encouraging more pregnancy without a comprehensive and clear analysis of the whole situation and the input of educated women will not succeed. If any country can successfully encourage more births it would probably be a socialist one. The GDR had relatively good policies for its time, for example.