It's like all these D-dinosaurs forgot that they needed to plan for their succession. I would imagine them working hard to make sure the new generation of politicians is ready. But modern career politicians will die in the saddle and seemingly are not worried what happens after.
Family owned businesses that provide generations with income so this plenty. It's the career politician that is the issue for me here, the ones that will die in the saddle. By not grooming successors, their base has no alternative to vote for.