I have not read his most
recent book, but I have listed to Peter Zeihan on a half dozen podcasts. Using demography and the structure and trends of age pyramids, he predicts the demographic collapse of a hell of a lot of countries in the next decade or two. In fact, he uses the aforementioned logic to explain Russia's current aggression - basically, they have less than a decade before their pyramid inverts, and they will not have the resources to wage wars of the magnitude they currently are. This is their last chance. His predictions are pretty bold, and I have read some interesting rebuttals, but at least he makes them. One of the most meaningful metrics to know whether or not an expert actually knows what they are talking about is whether or not they can make predictions that lean to truth.
Relatedly, he points to the United States strength in allowing massive amounts of immigration. Despite what you see on TV, we are one of the most immigrant-friendly nations in the world. I think that is great, but some of the current discourse would have one believe that a desire for a more selective form of immigration - a belief that the world is full of high powered folks who want to move here, and we should select for them over others - is somehow anti immigration. Not saying that is what you are saying at all, but it seems to dumb down a lot of potentially interesting conversations in other venues.
I do wonder though, what is the long game of immigration and growth - for anyone.