I disagree and I will play the devil's advocate. I can see the boredom of having an eternal life, but if it was ever achievable I wouldn't hesitate to seize the opportunity. Since I don't believe in the afterlife I think the only possibility for immortality is for living, physically existent humans. Why not?
Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you