IMHO, I am surprised at the school of thought that maintains that H would stay for the children when none of H's dad, mom and his maternal Uncle Spencer with whom H maintains links stayed for the kids.
As for H, IMHO there is nothing to be done with him...he just has not realised it yet. After Spare and whining about Nepal, any hope of any official diplomatic role is over. The scandals at various charities (African Parks, Sentebale) are yet to be resolved so more bad press may put H's ability to be a Patron at risk.
As for M, for her comparison will always steal her joy. She is a millionaire craving a billionaire lifestyle. But the math ain't mathing and will only get worse. She is in her mid40s in an industry that values youth in front of the camera and does not have the skillset to get behind the camera as evidenced by the trail of failed projects.
Trump will exhaust media oxygen for the next 3.5 years and at the end of Trump, Prince George turns 15...cue George-mania. After G, his sister C the fashion juggernaut will seize all the headlines, and L will soon follow with Louis-mania. And then, the great hunt for the next Queen Consort will ensue.
50-somethings, no matter the drama, won't be able to compete on clicks and will be dropped from the headlines and descend to oblivion. Then the real consequences of living a champagne lifestyle on a beer budget will come home to roost.