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People tend to forget how danged many of us there are. To remind you, we're 6.6 BILLION strong. Even if you wiped out 99% of the human population, that still leaves 66 million people on the Earth.
I do expect that humanity will experience a population crash at some point, for two primary reasons. 1) Our completely interconnected world will make the transmission of fatal viruses quicker, and higher population density will help its spread. Statistically, that virus WILL hit us at some point. 2) Current human population growth rates are unsustainable. Eventually we'll hit the limits of what we can support, and that hit will be followed by several years of starvation. I don't expect it to last long, but you'd be surprised how many people can die in a few short years of global famine.
I find the suggestion that we'll revert to stone age hunting and gathering to be rather humorous. Technology isn't going anywhere, because technology CAN be manufactured locally. Even if we were to go into a global societal meltdown tomorrow, it would be trivial to throw up a small hydro plant to run electrical power, smelting metals is a rather straightforward process, and there will be enough scrap metal around for millenia to build just about anything the people could want. As long as the technological knowhow to build them doesn't get lost, even advanced modern electronics could be fabricated.
I WOULD expect the population to be more rural, and less urban. A reduction in overall population increases the value of labor, so low-wage immigrant farm laborers will be a thing of the past. People will need to play some role in the production of their food supplies, which necessarily means a move toward smaller towns more oriented toward their surrounding farmlands. In essence, imagine the U.S. and Europe in the 1800's, only with better medicine and technology.
And the Earth. I don't worry about the Earth, and I never have. The Earth has survived assaults far more devastating than anything we've thrown at it, and it has always recovered. I think it will be CHANGED, but once our population drops much of it will begin to revert to a natural state again. Some coastlines may be slightly changed, and I'm sure there will be some areas that are still so polluted that they will have to be avoided, but overall the Earth will probably be in better shape than it is today.
As for how they look at us, I'm sure they'll see it as a golden age, simply because that's our nature. "They didn't have to work", "They flew through the air for VACATIONS!", "They imported food from the other side of the planet!" History shows us that mankind tends to forget the uglier side of our history in favor of emphasizing its good points. The Roman Empire was a brutal, bloodthirsty, war-prone nation that slaughtered innocent neighbors, enslaved women and children from all around Europe, and got off on gladiatorial matches. Despite that, we still see them as one of the pinnacles of early civilization. I expect that our descendants will do the same.
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