So how should we tackle both managerial capitalism and utopian communism then? Because if we ever try to find a third path in this case, it may end up leading to something more controversial. Corporatism could be a solution, but it is discredited as something horrible after WWII. Class collaboration is virtually impossible, with the upper classes being more likely to stay with their fellow globalist classes.
Well, let's look at the nature of the problem.
The way THASF describes it, the wellbeing of humanity is being held hostage to the greed of a small group of people who already have loads and loads of wealth and power, but who won't be happy unless they have everything and everyone else has nothing.
And you're asking for a political/economic system in which that can't happen? I have some thoughts.
Are you familiar with the trope about the mercenary soldier who is confronted by 3 people: a king, and priest and a wealthy merchant, each of whom want him to kill the other two?
All four of those people have power - but it's each a different kind of power. And when there are different centers of power, they can be a check on each other.
People who want to establish a tyranny have to do so by centralizing power. Not having any other balancing forces.
Communism for example - all economic and political power, even all religious authority - under the control of The Party. A Communist government will seek to control all that it cannot destroy, and destroy all that it cannot control.
The West right now is in the grip of a Plutocracy - what you get when money can buy power, and that power can be used to get more money, in a vicious cycle without any opposing forces.