They will get paid for appearing at live events, merchandising and fan clubs. This is the Jamaican model. This is almost impossible to answer now. Could be that marketing companies that create artist brands will generate the income, which they will pay a slice to their brands. I don't know.
Online traffic proves that most people visit only a couple of websites.
Music has been the culture industry hit hardest by the challenges of the internet because it relies on cheap technology and low bandwidth. Audio files can be delivered over standard phone lines reasonably quickly. Only when significant numbers of users have access to increased bandwidth will we see the net make a real impact on delivery of film, television and hybrid multimedia forms. But we should not expect Hollywood to be Napsterised overnight. Second, it will always cost a lot to produce compelling audio visual content that people want to watch.