I cannot see the logic of discontinuing production other than to align with current brain washing. The advantages of hybrid diesel cars would seem an unexplored avenue.
I suspect projected customer demand would be the main driver. I believe the big problem with diesel hybrids is coming up with a way to run the diesel generator in a way that plays to diesel strengths whilst allowing a clean emissions profile in stop-start urban environments. Current manufacturers seem to be wedded to the idea of having a mechanical drive train operating alongside the electric motors.
