I always thought we would have swarms of nanobots that chewed on the landfills for a decade or so and sorted the mess into tidy piles of pure elements.
Yeah, I've been wondering if mineral rights in landfills would make sense as an investment. It's an interesting collection of stuff-humans-once-had-use-for, and as recycling tech improves...
It will be amazing when the cheapest (maybe only?) way to get <raw material> is to recycle old discarded stuff.