I think we'll see the end of capitalism within our lifetimes; I don't think it'll look anything like the October Revolution. I think decaying material conditions will lead to increasing uprisings, jealousy over conditions in communist countries will lead to more uprisings, a decaying police state will lead to scared government officials making concessions, and Chinese foreign policy will also lead to western governments making concessions. I don't think there will be a clash between revolutionary forces and standing armies; think it'll be weird, faltering, and kind of pathetic.
Don't imagine the glorious leaders of the revolution and the protagonists of history; imagine some barbaric backwater at China's periphery painfully lurching into the communist era.