So debating closure of certain questions on META apparently is a thing, so I figured I'd give it a shot.
I recently came across this question: An empire to last a hundred centuries
Which I understand is popular but I couldn't help but knee jerk to how clearly it fits with the criteria of opinionative and too broad. (not that I normally care this much)
The simple fact is this question is akin to asking "how to make a utopian society" which obviously is a popular topic but at the same time completely unanswerable. If it were answerable, our current geo political strife would be over.
It's too broad because the sheer amount of factors that attribute to the stability or instability of a government can not be fully addressed in an answer here.
It's to opinionative because there simply isn't enough information and too prone to chance that the significance of any of the previously mentioned factors could affect the end result. You could even argue that an isolated island civilization managed to retain government for 10K years because of sheer luck.
Please note I only bother to bring this to meta because of the popularity of this question.