Anybody that understands politics understands that the two-party system is shit. They also understand that unless both parties agree that they don't like it and want to willingly allow more competing parties to sabotage their own efforts, it will never change.
So, saying that US democracy is fucked just because of that is a load of bullshit. Almost all democracies have two-party systems like that. Not even fucking Canada wanted to change their FPTP system, even when conservatives were abusing the system for 15 years. It was so bad that liberal voters in 2014 election had to tell their other liberal like-minded candidates "Yes, we like you, and we like your policies, but for the sake of the country's future, we have to vote for Trudeau."
In order for ranked choice voting on a national level to get incorporated, the elected officials have to vote to change the system that put them in power. Neither of the two parties' politicians wants that, since it would then be easier for someone else to potentially beat them, so it doesn't happen.