The Week has created a Bad Opinion Generator that gives documents some of the world's worst opinions and projections.
After 10 minutes or so, I came across a few repeats. So far my favorite is a 1970 William Helton prediction: ""Mankind also faces the ominous possibilities of armies of asexually produced identical soldiers…." Coming in at a close second is Microsoft executive Steve Ballmer's 2007 prediction: "There's no chance that the iPhone is going to get any significant market share. No chance."