I too found Zeihan earlier in the year on YouTube, and I just finished The End Of The World Is Just The Beginning. I agree that regardless of what you think of his work, it's well worth exposing yourself to.
For my own opinions:
- The demographic data and logic is really hard to argue with.
- The "this is what happens when systems collapse" scenarios also seem quite logical and well thought-out.
- The collapses themselves I'm more optimistic (pessimistic?) about though. In the same way that human incompetence is often blamed for progress not er... progressing fast enough, I also think the same will happen in reverse.
- I also don't think he offers enough weight to (generally non-American) economic systems as a way of stabilising an economic turnaround as population falls.
The bit that I'm struggling with though is how to actually use the information and ideas he expresses:
- If you knew that, in aggregate, the world will never again (in our lifetimes) experience the economic growth we've seen in the last 100 years, what would you do differently?
Personally I think the "in aggregate" part is extremely important. I suppose if you're able to, you have to find the industries/societies/etc that are growing (or stabilising, as we'll have to do), and become part of those.
That's likely to be a very difficult thing for a very large number of people to do though.
(And as you can probably tell, reading his work tends to leave you in an unusual mental place for a while. Which is one of the reasons I recommend it. But it does trigger a "think carefully here" reaction in my brain, similar to scams, weird internet forms and casinos. I just haven't figured out why yet.)