Famous last words…

"Computers in the future may weigh no more than 1.5 tons." -- Popular Mechanics, forecasting the relentless march of science, 1949

"I think there is a world market for maybe five computers." --Thomas Watson, chairman of IBM, 1943

"I have traveled the length and breadth of this country and talked with the best people, and I can assure you that data processing is a fad that won't last out the year." --The editor in charge of business books for Prentice Hall, 1957

"But what is it good for?" -- Engineer at the Advanced Computing Systems Division of IBM,1968, commenting on the microchip.

"640K ought to be enough for anybody." -- Bill Gates, 1981

This 'telephone' has too many shortcomings to be seriously considered as a means of communication. The device is inherently of no value to us,"-- Western Union internal memo, 1876.

"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?" -- David Sarnoff's associates in response to his urgings for investment in the radio in the 1920s.

"The super computer is technologically impossible. It would take all of the water that flows over Niagara Falls to cool the heat generated by the number of vacuum tubes required." -- Professor of Electrical Engineering, New York University

"I don't know what use any one could find for a machine that would make copies of documents. It certainly couldn't be a feasible business by itself." -- the head of IBM, refusing to back the idea, forcing the inventor to found Xerox.

And last but not least...
"There is no reason anyone would want a computer in their home." -- Ken Olson, president, chairman and founder of Digital Equipment Corp., 1977

(from an email)