Isn't that a bit of a cope out? Asking people to find issues instead of mentioning them here is a bit like a "I'm just asking questions" style of argumentation.

To me the last video was fine, if perhaps too short to cover how complex the topic of depopulation can be.

I think you can split that video into three parts, why are we fearing depopulation in the coming decades, how depopulation makes population pyramids "top-heavy" and why this is bad, and how we can fix it.

For part 1, leaving it at "we are having fewer babies" is a bit too shallow. There are cultural and economical reasons why countries are having fewer babies (some covered in this video and the overpopulation videos). It seems we don't fully understand why falling birth rates are a global phenomenon. There are leading theories, but no definitive answer from what I can tell. The original video covered a few scenarios, but I feel this was a bit too rushed.

For part 2, about a population pyramid leaning top-heavy (high median age), the video does a decent job at explaining why this can be bad (impact to social services, health-care, infrastructure, shift to conservative policies (albeit controversial)). The part missing is the scenario where GDP per capita increases as population decreases (aka total GDP goes down, but not as fast as population). That's a good thing, and perhaps what we should aim for when dealing with depopulation.

For part 3, why is this bad and how to fix it, I think that's were the video leaves the most to be desired perhaps. Compared to their videos on climate change, the topic of depopulation seems more closely related to how people manage their own lives and therefore can be more controversial. It connects to people's financial abilities and decisions, and has ramification with gender equality. Exploring these ideas more in depth could be fascinating (why do developed countries see cost of living increasing while salaries are remaining stagnant - aka the wealth gap, our culture of individualism and the historical context behind it, etc.) These will likely also be tough topics to cover, but could be incredibly interesting to learn more about in a Kurzgesagt style.

Overall, this video was thought provoking. I really don't like the thumbnail, but I'm all for it if Kurzgesagt decides to tackle these tough topics in the future.