I don't see how any of this makes sense.

>The #1 problem leading to humans not having enough to live comfortably is that we have an enormous number of humans and limited resources.

Taking this as true (it very evidently isn't), then since Europe already has declining birth rates, the logic step would be to prevent migration no? An influx of people would hurt.

>There isn't a very nice way to force people to stop having children. The remarkably low birthrate is an amazing outcome of a superficially intractable problem.

You say this as if this "amazing outcome" came out of nowhere, magically. People are forced into this because finances make it hard. That is not very nice.

>If the Africans catch up with everyone else and stop having too many children

Why would this happen? From your comment, it doesn't seem to be something to expect?

By the way

>People are choosing not to have kids. That's workable.

This sentence is so extremely out of touch as to be insulting.