One could argue that we do have moderm day timelessness; single use plastics that will take a few thousand years to be destroyed.
Given a reasonable extension of existing technology, we could eliminate that trash eventually. Imagine, say, machines designed to find plastic trash in the ocean, powered by ocean currents/thermals, that decompose the trash into basic releasable organics like CO2 and water. Just takes the will to do it. And hopefully someday, that will will exist.
And cleaning up the wreckage of the Industrial Revolution for the sake of future generations would be a legacy we could be proud of.