You should probably read the history of anarchism in Imperial Russia.

There were tons of assassination attempts against the tsars in the 1800s, and they even killed a tsar. Yet the empire fell due to an external war, roughly 100 years later.

Aristocracy became useless around 1600-1700, when gunpowder meant that peasant armies took over instead of knights, yet it took between 200 and 400 years for full legal equality to be introduced everywhere and some places still have nobility with special status, to this day, even in developed countries.