What is a browser?
Have a look at this video of a Google guy asking what is a browser in Times Square. People have basically no idea.
I don't know whether the interviews in this video can really be extrapolated, but my instict says there's something into it. When you are into technology you need to look ahead and construct the future, but a corner in your head has to keep you balanced and take into account the man in the street is very very far from your view. Just a reality check, your duty is to be ahead, as is the duty of any specialist in any field.
PS: I saw this video in a post of Seth Godin, which uses it to depict an unrelated point.