Including the well-known:
“There is no reason anyone would want a computer in their home.” — Ken Olson, president, chairman and founder of Digital Equipment Corp. (DEC), maker of big business mainframe computers, arguing against the PC in 1977.
And at least two that I hadn't seen before:
“The cinema is little more than a fad. It’s canned drama. What audiences really want to see is flesh and blood on the stage.” -– Charlie Chaplin, actor, producer, director, and studio founder, 1916
“[Television] won’t be able to hold on to any market it captures after the first six months. People will soon get tired of staring at a plywood box every night.” — Darryl Zanuck, movie producer, 20th Century Fox, 1946.