I didn't read the scientific articles but here's my point.
I think the main cause of the smaller birth rates in developed countries are the higher costs of rising a child. Of course, education increases those costs and increases the ability of people to calculate those costs and the consequences of having a son for their own lives and for the child without having enough resources. Less educated people are more likely to have a child they can't educate.
But if having babies becomes free (as in free beer) because of the cornucopia that allow us to stop using money, I don't see another way to control population growth than to plan births, which scares me.
If that's your main concern for the ideology of the zeitgeist sect, I think you should join them...
What 4v4l0n42 says is not very scary. He has said that TZM:
1) Doesn't want to abolish money.
2) Doesn't want an AI dictator to rule.
I thought they were communist but it seems that at least not all of them are. If the cornucopia finally arrives I will be happy to drink from it. I just don't think that money will become obsolete, it will just change. I have to admit that I don't believe bitcoin solves all the money problems, but it's a big step forward taking the power back. I won't join TZM nor read the material. I've seen three documentaries and I had enough. But I like this talk with 4v4l0n42 because it serves me to later argue with a friend of mine who is likes this idea of resource based economy, although his definition is closer to communism (and at the same time more concrete) than 4v4l0n42's.
By the way, 4v4l0n42, does your definition of RBE fit with
this one?