Agreed!
Look, those who say "we need to make way for the future" must understand that all reproduction efforts throughout the entire history of all living things only existed for one purpose, the closest thing to immortality we could get. We invest a lot of energy training entire new beings, and the "catch up" time with new generations of scientists is getting greater and greater simply because we as a species are attaining more and more knowledge. I can see a point in time where the time it takes to train someone to the point where they could actually be expected to make their own discoveries is greater than the current human life span, and science could grind to a hault. (In fact, I'm surprised an episode of Star Trek hasn't addressed this already. If it has though, I'm sure the fans here will promptly correct me.)
In other words, why waste time rebooting civilization every generation when we can just keep going on and on with just one? To prevent overpopulation, I'd say we just cut down on the breeding. Hopefully there will be a tech to take care of the desire to mate (rather than sterelization) by then, so someone CAN decide to mate at some point but the rampant expansion of the population won't happen because of drunken teens (though catholics would see it as sinful, they would probably also see eternal life on earth a curse rather than a blessing).
And again, you can always just destroy yourself. Skunky person, keep this in mind. Even if it is made completely illegal to do yourself in, what are they going to do, arrest you? Suicide is like the most convenient crime there is. You only get punished if you fail (though in my view success is it's own punishment, I love living). I'm sure it'll be a lot more acceptable once we are all highlanders.
Again though, it's a personal choice. If you want a limited life span, go for it. Natural selection does indicate those who die are less likely to survive than those who live though, so it would seem that the immortals are the ones more likely to proliferate.
The social implications:- No labour shortage and minimum wage $1 a day.
The housing crisis.
Living at home with your parents till you could afford to rent an apartment , aged 70.
The wars.
Why would minimum wage drop exactly? I'm not sure I see why that would be the case. I do see your point though. Who wants wastrels living forever? Still, with no way to determine who will and won't be useful to society, why not just give it to everyone?
As for wars, people can still be killed, and if they couldn't, war wouldn't really mean anything would it? Can you imagine?
Someone: Infidel! I will shoot you for heresy! *bang*
Someone else: Stop that.
First someone: Jihads just aren't the same...
I mean to say that without death war would just be an annoyance, and hitler would just be "a jerk".
But if you mean that wars would get so much worse with eternal life, I'm not seeing it. What would make them so much worse?
People can be losers no matter how short their lives are (well, to an obvious point, I wouldn't call a child a loser). I'm not sure that pointing out that someone CAN in fact be a lazy good for nothing for all eternity means anything. The parents always have the option of kicking them to the curb. Dying of starvation would still be in full effect.
What I would really like is, on top of having eternal life, the ability to metabolize almost anything this planet could throw at me and extreme resistance to damage and the elements, as well as a much higher tolerance so I wouldn't be so frickin' specific about where I'm "comfortable" (I'd like to be perfectly content sleeping on a jagged rock in the rain). Then I would no longer need to find shelter or food and can just live in the wild. Apply such exotic tech to everyone and you can say goodbye to wage slaves.
But then again, death terrifies me. I can see no point where I would say "this is so bad I'd rather give up any future possibility of it coming to an end and I'll just face nonexistance". In fact, give me otherwise eternal life and I'm off to prevent catastrophies to the planet, then preventing catastrophies to space colony 195, then facing the horror of the heat death of the universe. I mean if I have full access to my own mental faculties by that time I think I'd be able to easily modify myself to constantly be interested in living if at some point I started getting bored.