I think there's a lesson here: doing something in hardware isn't automatically cool, particularly for kids. It's harder to make things happen, so we veteran geeks get a thrill from it. We think that because it's physical, real, and a Robot, kids will automatically be excited. But for kids who are learning, and who don't appreciate the significance of the challenge, it's just hard and unrewarding.
My impression is that robotics programs in primary and secondary schools is that many have been successes, but limited successes. I mean, the relative expansion of Lego robotics in schools has coincided with a virtual collapse of computer science US K-12 schools in general.