I've done that a lot, and I find it an optimistic idea. Sure, we'd need to refactor some things in society to root out the hidden structural dependencies on life expectancy being double-digit years, but other than that? I see mostly upsides.

(And in terms of boredom, because I'm guessing that's what you allude to by invoking Q: you can always decide to end your existence after you get bored with eternal life.)

It's about meaninglessness. Maybe it's just me, but things (including life) that are finite are valuable and special for me. Also in terms of Lord of the Rings I would rather be a human or hobbit instead of an elf. But I respect elves and get your point, it's just not for me.

Eternity is an overwhelming concept. It's easier to tackle it through mathematical induction.

Can you imagine a day in which you feel so fulfilled, so bored, that you say to yourself, "it's enough"; a day in which you wouldn't be interested in what tomorrow will bring? I can't. Hence, by induction, I'd prefer immortality.

I'm probably not going to change your mind, just sharing the elvish perspective.