In the interests of provocation, I would argue that all these speculations on "two, three, many classes" are besides the point. Historically and ontologically speaking, there is only one class, THE class, the proletariat.
I agree here. And for further provocation, I would argue that Marx would not consistently agree. That at least in a large portion of Marx's work, there are a number of other classes. And that when he talked about other classes dying, he was wrong, in the sense that the world's population hasn't ever been more than 50% production workers and that the trend isn't headed that way. The world is more and more wage laborers, a group which I would say has the potential to transform into the proletariat, those who have nothing to lose but their chains and know it.
You can find "the one class, the proletariat" in some parts of Marx's wide researches. But that's different from saying that he consistently propounded the proletariat.
I jest




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Nice, unfortunately you wordiness have outed you as thoroughly middle class
I jest
The question is if the problem of the "middle class" is of a different class (pun intended) than the problem of authoritarianism or even fascism that can be present in the working class proper. If it is the third class it is required if it isn't it isn't.