Weallknew that the 1990stech boom would change the world. But then a funnything happened: Foryears brick-and-mortarcompanies happily coexisted with theire-rivals. Borders, forinstance, actually increased salesfrom 2000 to 2005 as it dueled Amazon. Now those days seem to be ending. Digital companies are so big, and growing so fast, that they're obliterating old businesses. Consider these four examples: The U.S. Postal Service says it will be insolvent by the end of 2011 without a bailout. Blockbuster and Borders have filed for bankruptcy. And music stores keep closing.
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