We need first of all a good idea of how to prioritize global sustainability programs.
And we need more and more innovation and education geared towards the reprocessing phase.
Overmolding is a superior technique, although for many applications you can find ways to join the flexible and rigid part separately for disassembly, like stretching it over a flange or over the entire product. Also flexible bioplastics are already available and further in development. Then again it will be more long-term thinking if there can be a process to melt and regrind the plastic so the elastomer/silicone is left from the overmolded product. We can always process rest material into materials such as bricks and leave them in static structures until we can reprocess them in the future in a more advanced way.