Sadly, a perverse spirit takes hold of humans with predictable regularity, and we do dumb things despite knowing better. Of course there is always the possibility of a civilization or an empire going into irreversible decline... but even in decline there are good times mixed in. I don't think western civilization is going into decline, though it will have to allow its mercantile, enterprising side channel the aggression and dominance that's such a part of it.
In other words, another 8 or so years, maybe sooner, maybe later, we'll have a different set of problems.
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