Computers think in zeros and ones while we humans waste our time thinking in tens and hundreds. Who knows how much more we could achieve if we just made things simpler and used binary?
Yes, it's apparent that the world would have evolved much faster, had the New Testament being written in binary form, and stored in a memory stick.
Why is it sure that the best of computers have something to gain from humans? Let's say it's 500 years in the future and chess has been solved. Houdini 9000 plays perfectly. By definition, Houdini 9000 has nothing to gain from any human.
This can in fact be seen right now. Checkers has been solved, and Chinook plays perfectly. Chinook has nothing to gain from any human players. In this case, Chinook + Human = Chinook unless the human is stupid enough to play a non-Chinook move, in which case Human + Chinook < Chinook.
http://www.chessbase.com/newsdetail.asp?newsid=3997
EDIT: And Chinook also only thinks in binary.