I think a major distinction between creating a story and gestating a person is that you are going to get to choose how the story plays out. Much like a child, Homestuck expanded in ways that the author most likely never intended back in early 2009. But continuing to shape Homestuck through its run is notably less damaging than pushing a teenager into what you want them to be.

As for purpose. I think most of the purpose is still there in the comic. Dead or not, people can walk into the mausoleum and take a majority of the value out while simultaneously leaving it for the next grave-robber. Many humans strive to build a similar legacy for themselves.

It's also just a really weird time to call Homestuck a corpse considering the trailer that just dropped. Sure there's good reason to distinguish the webcomic separately. But if Homestuck is a corpse, it's a whalefall. And I guess that makes the animation a baby whale but let's get away from the animation. "Destruction" is not the word I'd use. Nor would I associate it with death in most capacities. When there's water everywhere, it's the massive, slowly decomposing body that brings everybody to an uneasy truce in the name of free nourishment. Where's the destruction in that?

Finally, I'll object to the proposed cycle of "birth, achieving purpose, death." To say Homestuck was created for a specific grand reason is silly, frankly. Destiny isn't real. Purpose is found and decided upon as a result of living. You've got it all backwards.