I disagree with the fundamental premise here. I would much rather be immortal and stuck in an akratic loop for a few centuries - because a few centuries is very finite and I'll still be alive at the end.

While even if I become absurdly productive and self-controlled, I will still die like a dog of disease & decay in the likely event there is no Singularity and SENS fails.

Remember Steve Jobs: he used all the cutting-edge treatments and even used his billions to buy his way to the head of the transplant line - and died anyway.