If the promised final future is simply that immortal souls will have left behind their mortal bodies, why then death still rules - since that is a description, not of the defeat of death, but simply of death itself, seen from a different angle.

If death is all about parting with body then immortality is about being dead when alive.

If the soul is immortal then it is one with the Godhead.

Shall a man
grave his sorrows upon a stone when he hath but need to write them on
the water? Nay, oh /She/, I will live my day, and grow old with my
generation, and die my appointed death, and be forgotten.

Aging is a mortal term that my immortal spirit doesn't quite grasp.

I believe we can see the future because some part of us responds to the fact that past, present, and the future are one, occurring in a simultaneous time... Quite literally the future is now, and even on this planet we can shape our 'nows' by our actions. That is why it is so important to prepare not only for the rest of our lives but for all our lives to come--for immortality.