One flaw we have in Germany in particular is that the chancellor is allowed to stay in power indefinitely if people vote for that person, which potentially gives a lot of time to rebuild the society. It worked out with Merkel who is the anti-thesis of an authorization figure, but that might have been luck.

I don't know how resistant the German constitution and democracy is. I believe it's robust but that's also what people thought about the US with that "checks and balances" that turned out being fake for the most part.