The whole reason the US founding fathers are amazing is that they proved him concretely incorrect. US will celebrate 250 years of democracy this year.

That doesn’t disprove him at all: if the average one lasts 200 years and not all last exactly 200, then some will necessarily last more than 200. This is a mathematical consequence of what an average means.

It'd be hilarious if it was a fiction, some bitter comedic cautionary satire

what better way to celebrate the democracy by combining it with a celebration of the birthday of the Great Leader, with a soviet style military parade and an admonition that any protest will be met with the harshest of consequences.

I know that math makes it harder to come up with political zingers but if there are two civilizations; one lasted 150 years and the other lasted 250 years the average is 200.

If that's what you call a democracy, sure... I don't think most people will agree with you though.