Experts are not always visionaries and visionaries are rarely considered experts.  Here are some notable ‘blunder quotes’ from the experts:
“Television won’t be able to hold onto any market it captures after the first six months. People will soon get tired of staring at a plywood box every night.”
–Daryl Zanuck, film producer, co-founder of 20th Century Fox (1946)

“[The telephone] is a great invention but who would want to use it?”
— U.S President Rutherford Hayes (1872)

“There is no reason anyone would want a computer in their home.”
— Founder of Digital Equipment Corporation (1977)

“Everyone acquainted with the subject will recognize [the light bulb] as a conspicuous failure.”
— Chairman of the American Lighthouse Board (1880)

“Fooling around with alternating current is just a waste of time. Nobody will use it, ever.”
— Thomas Edison (1889)

“The wireless music box has no imaginable commercial value.”
— internal memo to the President of RCA (1921)

“Who the h*** wants to hear actors talk?”
— one of the Warner Brothers (1927)

“Flight by machines heavier than air is unpractical and insignificant.”
— Canadian astronomer (1902)

“But what is this [microchip] good for?”
— IBM Engineer (1968)

“We don’t think we’d do well in the cell phone business.”
— Steve Jobs (2003)

Experts envision the future and see only the present.  Visionaries see the present and envision a better future.