I think there's always a path to falgsc bc as long as people live the ideas underlying socialism and marxism will continue to be discovered. Marxism differs from most ideologies in that it's based on the observation of economic systems. Wherever, whenever those systems exist people will presumably make the same observations that marx did, whether it's on earth a thousand years from now or on some distant planet whose people we will never meet. Even if every one of us alive today were to be killed and every copy of Kapital burned people in the future who never dreamed of our existence would re-discover marxist critique of capital using their own wit and skills and the battle would continue until it is won. As long as there are people in the universe we can never truly be defeated.