'Can be'... I'd be curious what percentage actually is re-purposed and how much ends up in a landfill
Most trash heaps from 100+ years ago have something of value in for people today (antiques, museum artifacts, leftover gold/metals in mine waste, etc.).
It seems unlikely that today's trash heaps won't have something of value for future people.
The only challenge is how to stop leaching of poisonous stuff...