Reality need not be Google. I get fed up listening to all these people preaching some sort of doomsday scenario if Google was to disappear overnight. The only people who would be seriously troubled by this would be website owners (like me) who take Google's shilling in the form of Adsense.
Everyone else would have moved to Bing by 10am next day and Google would be forgotten in three months. We should not overstate their importance in the greater scheme of things.