"It is my understanding that they have not even made any nanobots yet"
Actualy i think that you will find that they have created a nano bot, it is able to raom freely about, most of this research is in early stages of development.
In reply to your comment about us only being tought it because they feel they have to. They arn't teaching it to us at all, we were given the task to research and create our own hypothesis on how we think man and machine will be intergrated in the coming years.
Also, as for your beliefs that nanobots will never be able to convey nueral messages fair enough, you don't have to think out of the box, but if you don't then you shall not be able to go anyhwere. Whilst at the moment it is theretically impossible to have a robot convey and pass on the neural messages it is not entirely impossible, scientists have given a man two artifical arms that he can contral as if they were his own. Another interesting fact it this, the human body uses many means to 'encrypt' the signals that it is carrying in it neural network, so far people have been able to crack some of these codes, this is how they managed to create this man his new arms, by studying the electrical impulses they managed to read it and replicate it.
http://www.livescience.com/technology/0509...lest_robot.html - Link to the smallest nano/microbot
http://www.engadget.com/2005/06/23/bionic-...-with-his-mind/ - Link to the 'bionic' man i was describing