I mostly agree except the "no political system can survive disillusion" bit. In most of the examples you give the political system survived.
And I can provide numerous examples: Portugal's colonial holdings (Guinea-Bissau, Angola, Mozambique) were unwound after the carnation revolution because the overseas wars were consuming 50% of the national budget while the Estado Novo at home was a corrupt, violent, authoritarian, corporatist state.
The Brits could not square a global empire while their countrymen were rationing food, etc. at home. That had to go as well.
Despite all the Cold War propaganda spread since the fall of the USSR, in 1991, the Soviet Union was still a first-rate military power, with 35k to 40k nuclear warheads and >150 divisions, totaling 3.4M troops. It could easily suppress any of those pro-democracy protests, and all the CIA's burrowing in the Sovbloc would come to nought.
But there was no longer anything worth fighting for. Even people within the Party infrastructure had come to admit that they'd been living for a lie, lying for a lie, killing for a lie-all that for a lie!
The Qing dynasty faced massive internal revolts (Taiping, Boxer), external invasions (Opium Wars), and technological stagnation. The empire resisted modernization too long, then tried too little, too late.
Overwhelmed by foreign powers and internal revolution (1911), it died because it could no longer defend the illusion of legitimacy.
In France's Ancien Regime, nobles were exempt from taxes while peasants starved; France had a bloated, corrupt court and massive debt (partly from helping America fight the British!), yet refused reforms.
Nazi Germany claimed to be defending “Western civilization” while practicing industrial genocide and totalitarian control over - wait for it - Europeans!
One contradiction doesn't bring down a political system, but it cascades, because a hypocritical system dives deeper into hypocrisy until it eventually collapses.
Howard Zinn, Chomsky, and most other anti imperialist intellectuals viewed history similarly badly and are looking almost as stupid in retrospect as Fukuyama did with his claim that history has ended. For every example they bring up, there's 5 counterexamples that they didn't bring up because in some cases the evidence for the good they did is locked up in a spooks SKIF for the next 50 years - or in other cases they didn't bring it up because America just isn't allowed to be the good guy anymore if you personally took part in America doing bad things.
The amount of damage that folks like Marx did through making people believe in telelogical views of history ( i.e. "Capitalism is GUARANTEED to destroy itself due to internal contradictions") is colossal.
Shit bad regimes which are based on lies are now stronger than ever. I'm willing to bet $$$ that not only does NK exist in 50 years, but it's stronger than ever and even more authoritarian. AI literally locks in power structures and perfects them.
There you go advancing the same teleological theory of history you're supposed to be denouncing.
Like the saying goes, history doesn't repeat, but it often rhymes: when institutions, states, etc. behave in a certain way for an extended period of time, we can infer what their future will look like by studying similar examples from the past.