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Anything of value (and lots of stuff that isn’t) is already recycled and obv MUCH easier/more efficient to sort at the front end than the back end.
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There will be a golden age when engineered fungi extract valuable substances from landfill. This will last for a brief period before the engineered fungi start extracting valuable substances from everywhere and gray goo scenario happens. 2105-2117 AD.
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Neal Stephenson's "Anathem" describes a seesaw process of cities emerging and collapsing from northern to southern latitudes over thousands of years. Each time, economically motivated scavengers take all the copper and other minerals out of abandoned cities