>As for what will take them down - all large institutions are failing right now. The public education system. The health care system. The government. The mass media. The immigration system, and general idea of national borders. The zoning / building code / housing system. Childcare. Wouldn't surprise me if we see the financial system, currency, and military go down next. The trigger is part climate change, part demographics, part COVID, and part the loss of trust triggered by the Internet and Big Tech.
Falling? When was the last time in a developed country when an educational system/heathcare failed as a system? Or the government (other than in Argentina), or Military? As for the concept of borders? No, that is not failing either, it's just people in some countries today became convinced it is not worth to use deadly force to defend borders. See for example Sweden, or France for where this path leads to. It is not a pretty picture, but it is very far from "systems failing". As for reasons, why these systems are under pressure I can definitely agree on demographics, but climate change affecting our education/healthcare systems? No way.
Periods of boom and bust are a feature of our financial system, I'm not seeing anything unusual. Currencies fail too due to mismanagement. But extrapolating this into some sort of overall systemic failure of everything caused by climate change no less is not rational.
On the global scale the biggest challenge in today's world is the growing power of authoritarian nations hell bent on global domination and continued enfeeblement(deindustrialisation, increased corruption, disregard for the rule of law) of the free world. Then demographics, then very far in the distance climate change.