I think the concept is really good. I wish I had the links to these videos you use! This is such a hard concept to visualize (convection causing plate movement), that I think videos and a discussion on these videos is a great idea. I think this would help get kids interested in something that is often difficult to motivate kids to understand. I would be interested in seeing your results. If you have had a positive experience doing this I would bump the rating up. :)
I am very interested in how this turns out for you. Anything that incorporates different ways of approaching a topic I am interested in trying.
Are these videos mentioned on YouTube?
Also, did you try doing a blog about the videos? I would be interested in how all the technology came together for you.