You may want to try it just once with a short unit, rather than attempt to convert your whole year to self-paced learning.
I think this would be interesting and difficult to try in a social studies classroom. I see how it could work well for math classes, but I am trying to see how it might work for a U.S. history class. Maybe some units could be individual self-directed learning during the school year? I could see taking one unit and having all the material up on the computer and letting the students complete it on their own. I think it would be important to make sure there is group learning as well since I believe that is especially important for social studies classes but I don't know for sure how that could be implemented with this style of learning.