There are actually some developing technologies which really do transform some polymers back to plastic precursors which could recreate full quality materials,

There are actually some developing technologies which really do transform some polymers back to plastic precursors which could recreate full quality materials, but these are all at a pilot project stage or earlier. But really until we get to a renewable majority power production, any garbage with carbon in it should just be burned in power plants designed for that kind of thing.