> No species is going to evolve in the next century which will be able to suddenly break down plastic and turn it into energy/nutrients.
Such a species already exists: https://www.sciencealert.com/new-plastic-munching-bacteria-c...
There are also bacteria that can break down nylon: https://en.wikipedia.org/wiki/Nylon-eating_bacteria
I don't understand why people are so dismissive of ideas that are a simple google search away.