> I'm wondering if an immortal life can be a well-lived life

Why not? It does not mean that we will be some omnipotent god. it just means that we wont age. You can still die from physical trauma, infections, cancer etc. So in practice this would mean that the average human lifespan is not say 70 years, but 120.

I'm pretty sure that humanity will eventually get to immortality (why not? We are already controlling most of our environment) but this will not be like an invention of a magic pill, rather the average lifespan will creep up by a decade or so with every generation.

Now we're at the point where we know whats actively killing you and what to avoid (we can also cure most infections and diseases)

in 30 years most cancers, and likely Alzheimers will be curable too. I'm also sure that lots of aging related conditions will be treatable too (say osteoporosis)

in 60 years we might know enough to start reversing aging effects, and fear of cancer will be a thing of the past, just like now bacterial infections.

.. and who knows when we will start to regrow limbs and fully reverse aging