Equally interesting is that we may be getting closer to "peak population".

I don't think we are quiet there yet, but there is evidence that the rate of growth is slowing, and in some places there may be population decline. If that trend continues then we may level off, perhaps even slowly decine.

Barring a major event (like a global pandemic which seems unlikely :) I don't think we see drastic decline. Climate Change though may affect things, although that will happen slowly and humans are very mobile, and adaptable.