The Soviet empire lasted about as much time as the time between the writing of the manifesto and its implementation by the revolutionaries (possibly less, depending on how you define the USSR's lifetime). We'll have to see how China's experiment goes (China appears to be succeeding through a combination of a culture with massive deference to authority and the fine art of mixing in enough capitalism to keep power-brokers from undermining the goals of the party in charge), but "Marx's manifesto bore successful fruit" is hardly a non-controversial statement.
But I stand by my assertion: we cannot know the future, and in the time-frame of the writing of his manifesto 'til now, the Unabomber has failed and his philosophy bore no fruit but death and a jail sentence. Perhaps he ends up a future thought-leader; I doubt it, but stranger things have happened.