Pretty bad marketing on the part of PFS, since once it's dead they'll have nothing to publish.
Would you care to cite an official Pathfinder source, since you seem to hang your hat entirely on these official sources, that the Golarian adaptation of Cthulhu mythos means that the entire multi-planar cosmos in which Golarian is situated* must inevitably be destroyed by the Great Old Ones?
* Since you did note that Alderaan is not a hopeless game setting, as people could leave before it is destroyed, clearly any remnant of the cosmos that someone from Golarian might reach must also be inevitably doomed.