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Probably too optimistic and unhinged, but maybe a species advanced enough for interstellar travel, building mega structures etc. are advanced enough to ascend to a higher plane of existence or alternate dimensions or whatever. Maybe there's some alternative to this reality that will be unlocked by advanced technology that made all advanced life prefer that, to here.
That's a really neat idea I've never heard before. Like, maybe our entire universe is analogous to the ocean floor sea-vents that life arose out of. Cold, and dead, and boring, and difficult. And one day we'll discover how to ascend.
I also like this theory. In the Ian Banks Culture series civilizations that get advanced enough head off into the “sublime” they call it. Basically a higher level of existence. In my own more simple version, I’d figure VR and the biological/cyborg mix get so good the powerful can start living kind of forever, so they head for that substrate and don’t need big megastructures for anything, they just need computing power.
Yeah, it seems very possible that at one point, civilization will turn inward instead of outward. Why go through the time and effort to colonize the stars when you can just create a cyber-utopia? If you're advanced enough, you could make it feel like an eternity while almost no time passes on the outside.
Sure, your planet might get destroyed by a cataclysmic event in the far future, but if you can make that feel like billions or trillions of years, who really cares?