B2C businesses are retailers or middlemen between the manufacturer and the consumer. The Internet is eliminating middlemen by a process known as disintermediation. Intermediaries are getting squeezed out of the marketplace. What you will see emerge are business models where the producers such as authors sell their books directly to their readers. In the B2B market, manufacturers still sell their goods to middlemen.
Someone eventually has to sell the product to the consumer.
They shouldn't, although the disaster probably won't be as bad. The B2B market is about 10 times larger than the B2C market. B2B is so much larger than B2C because B2B companies also sell to middlemen in traditional market channels. Some of these tradtional markets will be replaced by e-commerce, but a small portion that cannot logistically be sold over the Internet will remain. Watch for another market to evolve in the next 2-5 years that will involve manufacturers selling directly to consumers.