Cuba has survived a kind of economic siege and attempts to coup them for decades now. It’s always possible they could fall, but that’s true of the US capitalist class too. We live in uncertain times and the empire is trying to reassert itself in decline but the material realities don’t hold up. I think the US and israel are in somewhat mirrored positions right now, in that way. Israel is obviously more vulnerable as a whole, but both have more fronts open than they can handle, have global reputations in freefall, and are too stuck in belligerence to assert stability.

Also, I would not characterize the Bolivarian Revolution as defeated, from the information I’ve seen. They appear to be working through a difficult strategic retreat and some internal struggle to work through as a result, but the struggle for liberation is a war, not a single battle.

Your worry is valid, but I encourage you to zoom out and consider the larger picture.