A return into the future as false reality (retold)

 Unsure why I'm moved to share this. I find it speculative therefore incomplete. But the imaginative quality that this creation manmade might still be held together in over a length of time humanity might not exist. Yet, the information on it represents our extinction. That's what gets me. If it's discovered by another entity, the information on it seems unobvious (not curious) to the object that "finds" voyager over its subsequent journey once discovered. It's like a empty drink can on the street. Discarded like a thing that we once thought could excite us based on its discovery, only to be treated like space trash seems more likely. Is physics infinitely incomplete? What is the point. We travelled 200,000 years to prove nothing.

My question: what (if anything is worth knowing) forces us to believe that immortality is a natural cause for us as a species to act. Is this our mission or should we reconsider it?