"Will Google eventually be toppled? Anything is possible—the founders of AltaVista, HotBot, and WebCrawler probably all thought they were safe at one point, too. A government or two could someday seek to break Google’s hold on web services as they once did to Microsoft’s on operating systems.
But it seems a next-generation search challenger will need to feed on some sort of next-generation internet or form of communication. Virtual reality? In-app mobile content? Telepathy? Whatever it is, beating the Google machine will be a legendary feat."