I suggest you look up the definition of "capitalist" and "communist." All successful nations today are, by definition, "capitalist," as in the government respects the right of the people to own property. Yes, there are some successful mixed economies, but they are "mixed" because the government owns some of the means of production alongside the people, not the other way around. And even those few nations have been liberalizing over the last few decades, a trend which continues today.
By the actual definition of "communism" there are no communist nations today, nor were there ever any for the reasons I gave in my initial argument. The definition of communism I've used for this discussion was actually more lenient than how it is defined.
>The Communist Party of Cuba would be as surprised to learn that they aren't Communist
The Communist Party of Cuba would not be surprised at all. They're just playing the game they've been given, and to think that they don't know the score is to assume they are all idiots right off the bat.
>At any rate, the idea that all nations eventually trend towards capitalism is ludicrous
Every formerly communist/socialist nation on the planet save one has moved to liberalize their economy in the last few decades, because communism/socialism is inherently flawed. All nations do, indeed, inevitably trend towards capitalism. If they choose not to, they inevitably fail, and once they pick up the pieces, they inevitably choose the alternative, which has been proven to succeed time and time again.