There are even more dramatic revolutions to come. Look at what people like Kurzweil are predicting http://www.youtube.com/watch?v=WPqjYrLhDnk in context of things like Watson and videos like this http://vimeo.com/20928952

I think within 2-4 decades humanity (as we know it now) won't even be relevant.

Ted Nelson was saying pretty much the same thing at about the same time!

As was Vannevar Bush in 1945, whose paper As We May Think directly influenced both Nelson and Engelbart.