Why is this definitely true? Other economic/societal systems have fallen in the past. Why does that mean this one has to? Or is there some other reason why this statement is true?
I'm not trying to cast doubt upon this idea. I'm just trying to find out its justification, from a scientific perspective.
Cheers.
It's not definitely true, nothing guarantees it. Capitalism contains contradictions and its our role to help bring about the reality where those contradictions are resolved by the overthrow of the ruling class by the working class, as opposed to the reality where the contradictions are resolved in the common ruin of the contending classes.