The moral of the story is not only about one's attitude but that innovation can be hard to sell. People are complacent and resistant to change. Many tablets were developed prior to the Apple iPad. PARC was the creator of the GUI, mouse, WYSIWYG, Ethernet, etc. but failed to properly commercialize and profitably exploit such innovations.
Change involves overcoming a certain comfort level, breaking custom and tradition, new costs, new procedures, processes, new learning, etc. In many cases, the “buyer” doesn’t even know what questions to ask or even recognizes/acknowledges that he even has a big enough problem that needs to be solved by the innovation. The Seller can have similar issues of not understanding the pain points and, particularly, the pain points and needs that the customer cares about (or even aware of).
(This story and insight are courtesy of Allistaire Black from Huthwaite UK who is a a fantastic teacher of SPIN Selling.)