Just the surface...
It's amazing how far we've come... yet how little progress has been made. Take another look at the 1968 “Mother of All Demo's” and the 1973 Xerox Alto. Those were over 40 years ago. There were some astounding advancements over the years, but even our mobile devices use a large portion of the same metaphors and concepts (with minor variances). I have to wonder what advancements in the user interface of computing we will see over the next 40 years. Will another remarkable person follow in Douglas Engelbart's footsteps and give “The Mother of All Demo's 2: The Mother of All Demo's-er”?
And, if that demo is given, how long will it take for us all to realize that it has happened?