US geopolitical position is being eroded,

So are mountains. I wouldn't hold your breath waiting for those or US geopolitics to be ground down to sand grains though.

And it isn't even clear what, when that day comes, you will have won. Woohoo, the US is weak, the US isn't in charge! Yay! There is no more USSR in such a picture, it lost first. If you're expecting some resurgence of communism at that point, I think you will be disappointed. It makes it sound like you were always more against something than for something.

I mean, what do you have? China? I think the "People's" army showed how much for the people it was back in 1989. Cuba? Castro croaked. So have all the true believers. It's probably the closest to being the last real holdout.

US could expect the same kind of economic bullying directed against it that it’s been using to attack its enemies.

It could. I don't find this prediction implausible. Given what you know about China, does that make you happy somehow? It's about as communist as the Russian Federation is, though I guess that's easier to pretend untrue, given that the regime change was a little quieter.

If true socialism/marxism/communism did try to rise up somewhere near China, how do you think they'd react to it? Seems to be that they are at least as much your enemy as mine. I don't suggest that makes us friends, but in other threads you don't seem dumb or delusional... China's bad for pretty much everyone who's not a billionaire or high-ranking in the party.