I don't think it's 100% failed. While we have settled into being just another equivalent to other similar nations (the governments of UK, Australia, France, Germany, Japan, are all kind of similar to the modern US government), we have retained some QoL things that some people really care about: A hard-to-suppress right to free speech, a right to own guns (which promotes the illusion that the politicians in Washington can't get too greedy or the people will rise up or some nonsense americanist fairy tale).
Not only a failed experiment, but a runaway reaction that might damage the whole damn lab.