This comment may eventually seem as outdated as asking 'what's the point of Dropbox,’ but it seems we’re approaching the limits of human-computer interaction. It feels as if we’ve reached a point where technology, originally a 'tool' to serve humans, is beginning to erode essential aspects of our humanity, manipulating our core motivations. People may start to opt out, not necessarily due to a lack of useful features and functionalities, but because the overall cost to our humanity outweighs the benefits. This is something we’re gradually coming to realize more fully.
I kind of agree with your first part. For a while now, I've considered the possibility that a handheld device like an iPhone is actually pretty close to the ideal way humans actually want to interact with a computer. Even though it seems cool as an idea, I don't think people want their experience with a computer to be too immersive--handheld device might be the sweet spot.
