To learn you need to excite children about the process of learning. a robot can't do that.
Of course, (with sarcasm), we can't have just any child excited about learning. I remember the last election, discussing with my neighbors, both teachers, the candidates. They liked Bush, and having spoken with them before, I know they supported many of the same things he did, buuuuutttt, when the election came, they and their just-turned-18 yr old son all proudly voted for Gore.