You are right in your article. But I have a theory.
The mistake of the average billionaire is the same as that of the average privileged citizen a few decades ago: he thought his luck would last forever.
It didn't. Automation came along and he was out of a job.
This will not happen to the billionaire. But what will happen to him is a freight train called China.
And we all know what China does with its millionaires, imagine with those who are from another country.
The fact is that we are screwed. For with China's expansion and our rich believing they are untouchable, they will end up absorbing us in decades. And China will impose its rules, so goodbye to freedom of expression.
And this is not only going to happen to us, but also to the richest.
Therefore, I believe that greed breaks the bag, and unless they develop technologies that can compete with the Asian giant, the billionaires will end up just as screwed as everyone else.