Ah, Sicarius, your favourite argument. I thought we ended the last one with me bringing up population statistics showing you that your numbers were wrong/selectively used to give the impression that primitive hunter gatherers had comparable life spans to modern civilized humans... you never did respond. =)
I also pointed out that hunter gathering societies had ridiculously disproportionate death and murder rates, with statistics... do I have to be bothered to rustle them up again?
We don't have surplus production in general (though certainly in some industries), Western civilization is just relatively wasteful simply because we've gone far beyond the necessities of life. Don't worry though, population boom will soon remove that "surplus", hooray for incentive.
Civilization gives us more capabilities... I don't think it's civilization that is necessarily immoral (entirely your opinion), it's simply how society chooses to use it's capabilities. You can still go out and live as a hunter gatherer now if you wanted, and not too many people would bother you... but in a hunter gatherer society I couldn't be supported solely on what I believe to my strengths and I certainly wouldn't be able to debate this issue with you online! Hell, we most likely wouldn't exist because of population constraints.
You say that the collapse of civilization is inevitable... and I would say that yes... given enough time, all is ephemeral... but that's not to say hunter gatherer society is somehow the natural life and that civilized life is some sort of anomaly that will soon be corrected. Civilization is pretty much inevitable as well, simply because no hunter gathering society could ever hope to compete against the far more efficient and numerous populace of an agrarian society. I hope you notice that the places where hunter gatherer's still exist are the places that can't support agriculture. Humans (as do all organisms) naturally strive to maximize their energy intake, and if they get more from agriculture than from hunting and gathering that's what they'll do, if the opposite is true, than the opposite is exactly what happens. We aren't a deviation, we're a deterministic inevitability, bar massive climate change.
If you think modern society is bad, you should see early agrarian societies... if we reverted to hunting and gathering, you could expect us to climb that brutal and bloody ladder again. As for whether or not modern society will collapse in the face of it's own unsustainability... that doesn't necessarily make it immoral, it just makes it unsustainable. =)
With that said, I think you'll find that while population might decrease as carrying capacity feels the negative effects of our greed, civilization won't experience a huge collapse with us resorting to hunting and gathering... we'll continue to use agrarian practices and the methods of civilization as long as they provide us with a higher energy intake than "living off the land", which it almost certainly will. I definitely think you're also underestimating the effects of technological change in the very long run. Check out Thomas Malthus for a smart economist who also predicted the eventual downfall of society a long time ago only to have his predictions continually thwarted by exponential increases in productivity due to technological advances.
Hey, if we polled civilized peoples and asked them if they'd prefer to be civilized or hunter gatherers I think you'd find they'd choose civilization. Hell, if you polled primitive hunter gatherer's after explaining to them the luxuries of civilized life, they'd probably choose civilization too... at least, that's what a lot of Native Americans (who weren't slaughtered or cheated) chose... though the notion that Native Americans were hunter gatherer's is flawed to say the least. =)