It is an old argument because communism can mean different things. What you mean with communism I would rather call more precisely real socialism [1] Now those real socialist states had as their goal, or at least said so to achieve communism: "the establishment of the communist society, which is a socioeconomic order structured upon the common ownership of the means of production and the absence of social classes, money and the state" [2]

[1]: https://en.wikipedia.org/wiki/Real_socialism [2]: https://en.wikipedia.org/wiki/Communism

You could also ask: How many millions more have to die before we overcome capitalism?