It would be incredible if they could make plastic that didn't break down. But given the history of plastics, I would have to be very convinced that whatever they do to it isn't making it terribly toxic in ways that we don't measure. I would rather ditch plastics for better materials than have to check that yet another new acronym isn't in my water bottle.

It's keeping it out of the air and water that we need to work on. If we properly trashed our plastic, it would not be floating in the ocean.

We need it to break down properly, or not at all.

Only inorganic materials will last forever. We can reuse metal and glass and ceramic forever but never a plastic.