On January 8, 1982, the AT&T divestiture consent decree was announced. A company with $150 billion in assets--more than General Motors, General Electric, U.S. Steel, Eastman Kodak, and Xerox combined--the country's second largest employer with over a million employees, and the nations most widely held security with over three million shareholders, was to be broken up on the first day of 1984. Many economists, government officials, people in the telecommunications industry, and media observers predicted dire consequences for "the best telephone system in the world."

Years later, some...