Actually, I would say this community indirectly predicted the iPhone price drop.
So many times when people would mention the idea of an iPod touch-like device, people would reply, "That would be commercial suicide for the iPhone," or "That would cannibalize iPhone sales," or "Why would Apple want to kill the success of the iPhone so soon?" etc. etc. As we got closer to the keynote and rumors started spreading about the iPod touch, it seems like everyone kind of forgot about how Apple would keep the iPhone hype going after releasing a device that ultimately did the same thing iPhone did, sans the phone and the (cheapest) $80 AT&T monthly plan. When you start thinking about that, one of the very few options Apple has is to lower the price of the iPhone.
Out of all the far-fetched speculation I've seen on here in the past, I'm actually surprised nobody saw it coming.