If the Endless are just projections, then it makes sense that they disappear when the terminals shut off. If they are comprised of memory aether, then that means they don't have full souls or fully corporeal forms, which likely can't keep themselves together without the active processes of the Terminals. I believe it's said that Sphene needs souls specifically because using them allows the Endless to be given form without turning them into full living beings that require all the things that life needs, although I can't fully remember--half checked out by this point in the story.
As for storage, it's possible that preserving the memory aether is an active process, as it's not really meant to be separate from the soul until it's in the aetherial sea. Without the active processes of the terminals, the aether probably breaks down into its less-structured constituents. Don't ask me if it's possible to copy memory aether or commit the information in it to something like a tomestone... probably beyond Everkeep's technology to do so. If they could pick apart the contents of memory and souls, then there wouldn't be anything stopping them from manufacturing their own without needing to commit multi-genocide across the reflections.
Probably just him being somber and hopeful, I doubt Erenville is going to completely pick apart the machinations of Etheirys' afterlife moments after 'killing' his mother.
We don't fully know how death and rebirth works in the world, though, so maybe there's a chance that her soul and her memories find each other again, or perhaps her memories will be given form in the aetherial sea after we shut off the terminals. We see Moenbryda in the Aitiascope even though she supposedly gave all that was her toward the annihilation of what's-his-name Ascian, and she ended up down there just fine. Magic works in mysterious ways.




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