In my view, consciousness is a process and must ultimately end. That's not necessarily an appealing scenario on a visceral level - most of us have fairly healthy survival instincts, not to mention loved ones the loss of whom we would mourn / have mourned. But most if not all of the evidence, biological and otherwise, points to mortality of the soul. And even if you afford "soul" the meaning of a consciousness that can persist while disembodied, there's still the same issue as that stated by the Narrator in Fight Club
- on a long enough timeline, everyone's survival rate drops to zero. If there is a finite chance of your consciousness ending (by entropy, happenstance, a mercurial God changing its mind or some other factor) then given enough time it is certain to happen.