I am not saying this going to happen. Yet there is enough tension in this world with everything that is going. Whether by nature or by force eventually over civilzation will face a major diaster again. How would you suggest to rebuild society/civilzation to make it better than before?

Change the definition and rules regarding corporations:
1. Corporations are not individual persons--stop allowing them to act like it under any/all circumstances.
2. From top to bottom, corps need to be structured as little democratic republics, not fascist dictatorships. The corp owners and CEOs are the decadent evil "elite" we always complain about. Strip these hitler-wannabes of their ability to run around like unchecked power kings and the world will change for the better.
3. If crimes are committed within the corporation, the corp as a whole "goes to jail" and becomes unprofitable. No more of this nonsense where a corp offers up a fall guy and then continues marching down their same destructive path, screwing up the entire world for their immediate profit.

More could be said here, I'm sure.