feeling quite apprehensive about the ending

knowing that they're all going to live immortal lives together makes me feel like the story could end at any given time since there essentially won't be an "end" to their stories together, but knowing that immortality is a component here and having read too many stories on the topic, I just know realistically it's not going to end well :(( hoping we can just end on a random Wednesday and keep things light and hopefully like a Disney ending lmfao