Not a pretty picture. We are being made to be subserviant to minorities who hate our guts. I think we have already surpassed critical mass where higher birthrate would do any good. It would be too hostile socially to raise healthy children. We do have networks of sorts but it's not the same as sharing the same ethnicity and customs.
The Hispanics could end up being just as much trouble as the jihadis. A lot of them are already full of hate, and it's not like they appreciate being here. Ours are going to be squeezed like the pit and the pendulum and no way out.
When you look at how Germany encouraged families following the massive losses after WWI (while France did not), it appears it is never too late. France, which had held off the Germans for four years in WWI, fell in weeks 25 years later.
As long as the children understand the situation as they age, they should be fine.