The general opinion here was that Apple would not make a smaller iPad and there were pages of reasons why it was a bad idea. Lots of pages why. Then when they did, it became the most popular iPad. It wasn't Retina, and most here stated that Retina wasn't needed and it was fine. Next, Retina was introduced to the mini, and no one could live without it.
To me the general consensus here for the past few years was that the iPhone was the perfect size and those 5" Android phones were ridiculous. Now that Apple is obviously going to make a bigger iPhone, the general opinion has changed that bigger will be better. Larger phones have been viable from other manufacturers for a few years now, and with better battery life than the iPhone currently has. Apple is just late to the game with the bigger screens, no ifs and or buts about it.
When NFC was rumored for the iPhone 5, this forum was largely in favor of it and anticipating it. When it didn't happen and I think it was Samsung? that included it, NFC became a gimmick and an outdated technology. Now that the iPhone 6 is rumored to have it, it suddenly finds favor here.
Higher quality audio has been available for a long time now. Apple just chose not to sell it on iTunes. But prior discussions here lead to the generalization that nobody could tell the difference for any quality over 256kbs and that audiophiles were crazy and couldn't tell the difference for anything above CD quality sound. I'm guessing that now HD audio will be a great idea.
Again, I am not singling out any individuals about this, just the overall forum opinion. IMO, it has swung from one end to the other on each of the items I have brought up. This isn't criticism, it's my observation.