I think you underestimate the impact of technological progress.
Back in the day, you needed an army who could betray you. Tomorrow, you can deploy a fleet of self-governing robots to kill thousands. Of course, only accessible to the rich.
For ordinary folk, the future is looking grim indeed.
From an evolutionary perspective, only the ones who survive matter.
So in that spirit, the only way to create a society resistant to power consolidations is one that actively recognizes, seeks out and annihilates said power consolidations.
As otherwise, they will annihilate everything opposing them -- as history tells us.
There are gentler social traditions to distribute wealth and power so as to avoid consolidation. Probably the post-colonial world is beyond that point.
A scary prospect, to be sure, but in the grand scheme of things.. "The secrets of evolution are time and death" as Carl Sagan said in Cosmos.