But what you've posted is science fiction, in contrast there have been a number of historical civilization collapses. Something that's easily conceivable in the mind isn't necessarily practical or going to happen.
It's been over 50 years since humans last set foot on the moon. While there's hope that man will land on the moon again by 2025, success is not assured, and a catastrophic accident could set manned space missions back by decades.
GP said "there can't be any human civilizations that last indefinitely" and in response I gave an easily conceivable version of how human civilizations can last indefinitely.