If your mood changes every month, and if you die in any month where your mood turns to suicide, then to live 83 years you need to have one thousand months in a row where your mood doesn’t turn to suicide. Your ability to do this is aided by the fact that your mind is internally divided; while in many months part of you wants to commit suicide, it is quite rare for a majority coalition of your mind to support such an action.
When there are powers large enough that their suicide could take down civilization, then the risk of power suicide becomes a risk of civilization suicide. Even if the risk is low in any one year, over the long run this becomes a serious risk.
Alas, central power risks central suicide, either done directly on purpose or as an indirect consequence of other broken thinking. In contrast, in a sufficiently decentralized world when one power commits suicide, its place and resources tend to be taken by other powers who have not committed suicide. Competition and selection is a robust long-term solution to suicide, in a way that centralized governance is not.
This is my tentative best guess for the largest future filter that we face, and that other alien civilizations have faced. The temptation to form central governments and other governance mechanisms is strong, to solve immediate coordination problems, to help powerful interests gain advantages via the capture of such central powers, and to sake the ambition thirst of those who would lead such powers. Over long periods this will seem to have been a wise choice, until suicide ends it all and no one is left to say “I told you so.”
Future filters could result from either too little or too much coordination. To prevent future filters, I don’t know if it is better to have more or less world government.