There's been plenty of examples of workers seizing the means of production and establishing sustained non-capitalist organization (State or otherwise). We have any number of strategies to choose from: The PRC, Soviet Union, Syndicalized Spain (my favorite, seems the least likely to lead to police state), Vietnam, Cuba. The question thus isn't "how," but more specifically a couple other questions: "How do we prevent capitalist forces from liberalizing our movement (PRC, Soviet Union)," "How do we prevent fascists from killing us all (Syndicalized Spain)," "How do we prevent becoming a state-capitalist police state that halts the revolution (PRC, Soviet Union)"?
The hard part seems to be for the workers to keep the means of production after they are taken. In all those examples, you end up with a leadership that owns everything nominally "on behalf of the people". If anything, democracy gets the closest to that ideal, a compromise with all it's flaws.
Well, it's rather patronising of of me to call that "the hard part", after all the terrible struggles workers have gone through to earn a seat at the table, but you know what I mean.
All of the examples you gave caused much more tragedy than the system they meant to replace.
While this is certainly the more interesting question, the unfortunate reality is that the ideological complex of capital (even if weakening, and no longer effectively reproducing itself) is still strong enough that most in the West can't even imagine a better world (other than "less bad capitalism"), much less think about how to get there. Consequently messages like the above are of great value in moving more people towards a point where questions like yours become relevant.
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