I wrote up a CS bachelor's curriculum in 2012 using only Coursera courses, and had the same problem with the lack of fundamental math courses (http://www.thesimplelogic.com/2012/09/24/you-say-you-want-an...).

I do think there will be a full CS curriculum from one of the MOOC providers soon, but I don't think such a curriculum will produce many "graduates" unless it is paired with in-person instruction of some kind.