To expand, we might find out the hard way that having an expiration date was a feature of our species, not a flaw.
Of course it's a feature; it still doesn't mean it cannot be stopped or considerably postponed.
All it would take would be one billionaire who invested in long term bonds, à la Hitchhikers Guide to the Galaxy…
Indeed; the biggest reason is surely cancer.
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Walk me through it: in order to get dictators killed, because they defend themselves very effectively, we should put everybody on the planet under a biological death sentence, which will get the dictators too.
No, I cannot endorse this.