> B2C businesses need consumers

Businesses need consumers when those consumers are necessary to provide something in return (e.g. labor). If I want beef and only have grass, my grass business needs people with cattle wanting my grass so that we can trade grass for beef, certainly. But if technology can provide me beef (and anything else I desire) without involving any other people, I don't need a business anymore. Businesses is just a tool to facilitate trade. No need for trade, no need for business.