Immortality. If it were a question of, "Should we institute immortality on a broad scale, assuming it became feasible?" then obviously not. We'd be shooting ourselves in the foot with the overpopulation argument. If it were a question of "Hey silversturm, you want to live forever?", which is what I think the topic is about, then I'd have to do some thinking.
For me, it would come down to a choice to make a sacrifice. The sacrifice: to choose yes.
The upside... I believe that for the right person to become immortal, it would be beneficial to the human race. I say 'right' to distinguish between an immortal who stays at home and sleeps while the human race lives and dies and one who promotes the human race.
The downside... It would be very difficult to see everyone you know perish - time and again. It would be very difficult psychologically when you're floating towards Tau Ceti once Earth has been blown up by space aliens (what would you do with all that free time?).
To be immortal would represent such an opportunity for good. Yes this is an idealistic argument. Point: acquisition of knowledge. When do they say that the last person who knew everything in the world died? How much knowledge can a human today attain before his/her death? Will we reach a threshold where the technology is so advanced that it takes a full lifetime just to understand what we have, thus limiting what further inventions we can produce? (These are meant just to highlight the issue; obviously one can make arguments for continual technological advancement)
If a person could learn and continue to learn forever, and that person has a pro-human spirit, that person could do things like (again idealistic) try to unite us as a race, help people better understand themselves, and further the technological advancement of the race (assuming such is positive, which I think it is). Such a person could practically contribute in every aspect of society. I'll leave all the details out so as not to bore anyone but this is the first thing that comes to my mind if someone posed said question to me.
As for non-sci-fi attaining of immortality, I cannot agree. Huge life-prolongment sure, but unless they find a substitute for oxygen & blood, completely changing our physiological processes, then we won't live very long once if our ecosystem changes and in an extreme matter Earth is destroyed (again just used to highlight that floating in space would not be fun
).