Costs do matter of course but get anywhere close and you will have a mandated market in which consumer products in particular will fit. We all want plastic that in the long term cannot truly survive. Today we have plastic that loses its integrity in about twenty years but still resists biological breakdown. Thus we have floating plastic dust in the ocean.
We want to know that that can be made impossible or at least short lived. It is obviously a difficult problem but the winner will own the plastics market thereafter.
This is actually great progress and should start showing up soon enough.