Humanity, a sufficient majority thereof, simply stops playing the game. Money was a concept. It is now ignored. Corporations were a concept. They are no longer believed in. Ownership is a bouncing cheque with nobody caring to cash it. Most people stop playing "private business". You owned a railway? It's been automated. You owned a steel foundry? It's been automated. It answers to the world direct democracy, not to you. It's busy making things for free. And everyone else is busy doing their vocations. If you wanna go hide in a valley, sell things to each other and hope for civilization to vanish, go right ahead.