I think it's not exactly a fair comparison, because capitalism and communism are both very new economic systems. And, in the time communist systems existed, they were existentially threatened by high GDP nations.

I think, it's clear to me, that capitalists feel extremely threatened by the mere concept of Marxism and what it could mean for them. Even if it's happening on the other side of the world. They will deploy bombs, soldiers, develop nukes.

I'm not saying that it works and it's good. But, consider: most capitalist nations are abject failures as well. There's only a handful of capitalist nations that are developed, and they stay developed because they imperialisticly siphon wealth from the global periphery. We don't know if this system is sustainable. Really, we don't.

Since WWII, the US has just been riding the waves of having 50% of the global GDP. It's not that we're doing good - it's that everyone else was bombed to shreds and we weren't. We've sort of been winning by default. I don't think that's enough to just call it quits.