Is this problem on Marxism addressed by any philosopher? My issue is that things like the Proletariat Revolution and the socialism to permanent Communism is always something that its forthcoming. It might seem to be peering over the horizon but when it doesn't, the answer can be "wait and see."

So to a Marxist or Communist (I admit I am unfamiliar with the difference so if that's a hole in my argument, let me know) there's no way to change their minds because it's always in the future.