What kinds of business models will decentralized applications have? Any good examples? A decentralized web seems like a logical next-step. Although, it's hard

What kinds of business models will decentralized applications have? Any good examples? A decentralized web seems like a logical next-step. Although, it's hard for it to happen just by developer power alone. Once viable business models and success stories emerge around decentralized applications (like ads on P2P file sharing client?), IMO, this will really pick up steam.