Not necessarily. Consider the (admittedly dystopian) future where everything you do is hosted at Facebook.com. DNS becomes a vestigial remnant of the old Intern

Not necessarily. Consider the (admittedly dystopian) future where everything you do is hosted at Facebook.com. DNS becomes a vestigial remnant of the old Internet, and Facebook does de facto name resolution on it's private servers. New things can then develop within the proprietary Facebook ecosystem, in part because FB controls (more of) the entire experience. (Come to think of it, why doesn't FB develop a browser and an OS? And hardware while their at it. The fewer middlemen between you and your product the fewer risks you'll get cut off from them/it.)