Frankly, i don't understand this, since nothing that we hear or see during its cinematic cutscene suggest to us the idea that the world has ended.
Just because a religious zealot wrote on a scroll that god will bring paradise if you kill yourself in order to become a murderous poltergeist, and some the things he wrote about were not just a bunch mumbo jumbo it does not means that he was right. After all, if this were true, man, that's means that someone has to been able to complete said ritual succesfully. Big kudos to our society, for being more resilient than a space Cockroach and not changing in spite of the whims of a bunch of apocalyptic entities.
To the people that is so against this possibility: i can understand that the prospect of the last entry in the main series ending with a (quite literal) glorified Game Over is the most disappointing and depressing thing since the Phantom Menace, but still, you don't need to act like James Sunderland. Seriously, asseverating opinions based on subjective reasoning while, at the same time, disregarding evidence that point to the contrary is not a valid claim