[yourkin]

Finite lifespan for an organism stems from the necessity to adapt to changes in the environment, thus -- generations with a cycle of life and death. Brains allow to adapt without physically having to upgrade to next gen. It seems logical that if or when we get to have updatable wetware (in software or somehow else, the options are open), the concept of individual immortality will make sense with how the universe works.

[leggomylibro]

The computers would still stop working eventually; the universe as we know it also has a finite lifespan, and a machine will always require some amount of energy to function.

[yourkin]

Well, there is a notion that there is a Darwinian evolution of the Cosmos (https://arxiv.org/pdf/gr-qc/0205119.pdf), and one might argue that we can't be sure about the future of the universe (especially adding the unknowns regarding multiverse and that whole line of thought) and what future technology might bring, regarding even, let's be optimistic, potential changes to the fabric of timespace itself. Given the non-zero chance of a technological singularity happening even in our lifespan.