The Marxist-Rodgerist works with two scenarios:
1 - a Marxist-Rodgerist revolution does not take place, therefore humans will fall into the behavioral sink of worshipping foids to the maximum possible extent. In this case, humanity ends on Earth either by behavioral sink (mouse utopia style collapse) or external factors such as meteor strike or the sun expanding and boiling the oceans. Either way, humanity is doomed in 100-200 million years tops.
2 - a Marxist-Rodgerist revolution takes place, and within a century humans are already colonizing other planets in the solar system and become an interstellar civilization in the next couple of centuries. In this case, humanity will only end with a total war against a mightier hostile interstellar civilization, or with the heat-death of the universe, many trillions of years into the future, although (according to some theories) it might still be possible to send information to another/next universe, and thus our Marxist-Rodgerist brothers would arrange for the continuity of our Supreme Gentleman's lineage for all future eons and universes, parallel or otherwise.