While they're heroic historical figures today, there was a time when Orville and Wilbur Wright were viewed as crackpots. When the 20th century dawned it was accepted wisdom among serious thinkers that man would never fly.
Interesting about Orville is that while he envisioned what few did in terms of flight, the very notion of broadly owned automobiles struck him as cockeyed. Supposedly they were too unreliable. What about those GPS systems that eventually made the driving of now ubiquitous cars quite a bit simpler? The initial proponent of them in the private sector had scores of proverbial venture capital doors slammed in his face on the assumption that regular people would never want (or pay for) navigation.