Apart from the shilling / advertorial, this is really interesting. It's an excellent analogy that Keen makes between PoW and PoS.
I suppose the obvious rejoinder is that the early cryptohackers and Bitcoin enthusiasts were drawn to it precisely because it was not like "society". Keen here of course means society as it is, not just any group of people. In other words, the rich decide by right of their riches.
I do not disagree that that is a practical way to proceed, only I disagree that it is some kind of massive oversight. It is not.