Until there's a reasonably priced industrial scale process to efficiently reprocess plastics into indistinguishable-from-virgin plastic precursors, I think all plastic waste and similar garbage should be burned in well maintained waste-to-power plants and eliminating this source of semi-fossil-fuel energy should only be considered a priority when all other fossil fuel power sources have been effectively eliminated.

We're already burning things for power, might as well have that crude oil take a detour into consumer products for a while first, and because it's useful in several ways, make it last in line to eliminate (and at the same time offsetting some oil/coal/gas production)