>>281794354
Both ideas are less detached from reality than 65 million years old cavemen and resurrected samurai.

You could introduce a yautja-esque alien from a post-scarcity society that wrangles dangerous fauna to feel alive in the absence of there being anything to do, ergo fighting is the beating heart of what it means to be alive typa of thing. You could make the epilogue be the arrival of aliens, to communicate that there's always a bigger fish in the sea. You could make a robot that is ultra-duper powerful but mindless/soulless and the characters struggle to find the will to fight it. There's plenty of things you could do here.