Almost certainly the collapse of democracy as a political system and the end of nation states. Also a collapse of the human economy and the rise of the AI economy.

Other people have made this point but the short of it is: for the last few hundred years having more humans on your side meant you would probably win a violent conflict with a party with fewer people, ergo majority rule was the mostly peaceful equilibrium. Powerful technology, specifically AI-enabled drones, robots, etc. changes this dynamic to whoever has the most capital: manufacturing capacity, energy access, compute access, etc. This changes the political equilibrium to dictatorship by capital holders. As the value of human labor decreases due to AI and automation, humans will be priced out of the economy and AI agents will transact with each other. There will essentially be a parallel economy with AIs transacting to build e.g. data centers and solar arrays while humans live in squalor because their labor is effectively worthless relative to AI and robots.

This isn’t inevitable but without major changes wrt. AI regulation and capital accumulation it seems like the most likely result. Even with better governance it still seems likely governments will be incentivized to ignore their citizens to accrue more power by funneling money into the AI economy.