First of all, I have to be honest with you, I find that attempting to predict the (reasonably distant) future, is one of the most pointless activities one can engage in.
With this in mind, take what I say (and what everyone else says) with a grain of salt. It is nothing more than an unfounded, unjustifiable opinion...
Obviously the future will bring with it good and bad, but I think that, the good will far outweigh the bad, as it most certainly has done in the past. Although ludites are very quick to point out the horros of the atomic bomb, and other such things, you would do well to realise how much good technology has done for you. It is a simple fact that the majority of us on this board would simply not be alive today if it were not for technology, We would have died from some illness as children. Also bear in mind what would have been considered "old age" many years ago. The idea of a person living to be 70 years old would have been simply unspeakable.
In short, technology has saved vastly many more lives that it has killed.
So extrapoloating this trend to the future (which is all we can do in the business of "prediction") I would see lives continuing to get longer, (perhaps due to the ability to replace worn body parts), but also many new challenges that need to be overcome.
Will we eventually put an end to ourselves? I would tentatively suggest that we won't, though I would predict that sometime in the future there will be some kind of global war with massive casualties, but I doubt that war will result in complete extinction.
How will we eventually die? For me, the most likely event would probably be some sort of global epidemic of some highly evolved disease which is resistant to any of our technologies, and which spreads too quickly to give us enough time to research a way to stop it.
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