Few people seem to realize that the reason we have certain systems today is because of scaling laws. Other systems didn't scale as the population grew over time.

People say we're going back to feudalism, not realizing what that means. Feudalism doesn't scale above a few million people. We have billions.

The natural progression is, if we fall back to feudalism, the difference in the scaling laws will cause sufficient deaths until we are within the operating range of that small minority. Assuming conflict doesn't destroy the environment (as those using Mutually Assured Destruction would rightfully use during such existential threats of conflict).

What you have follows the same general plotline of Fallout where corporations induce a resource war for profit and control after Reclamation Day.