But the cynic in me is wondering about the articles 10 years down the road talking about how these enzymes are now basically "salting the earth" and we can't wait to figure out how to get them out of the soil and water.
Though a part of me wonders how much more it would cost to put in a subway when they already have the ground dug up.
More worrying would be the by-products of the plastic degradation reacting and producing something harmful.
Of course if we assume a remotely industrial era progression of advances oil reserves may be near-worthless. Why dig down say fifty feet for enough oil to fill the shelves of a Walmart camping section?
Just because we don't want to stick with the good ol' reliable 1000-years-to-break-down pollution like the way you put it, doesn't mean we should jump on the first promising path we see. Or else you might find yourself in ten years with all the seagulls dead or something.