In Google We Trust?

Felix Salmon wonders what would happen if Google ran aground:

Google is too big to fail. If Google went down tomorrow, the loss of $100 billion in stock-market value would only be the tip of the iceberg in terms of the total economic loss associated with such an event. Between AdSense and AdWords, Gmail and Blogger, Google Docs and Google News, the company has built itself into an indispensable counterparty which would take many years and hundreds of billions of dollars to replace.